open

adjective
\ ˈō-pən, -pᵊm\
opener\ ˈōp-​nər , ˈō-​pə-​ \; openest\ ˈōp-​nəst , ˈō-​pə-​ \

Definition of open

 (Entry 1 of 3)

1 : having no enclosing or confining barrier : accessible on all or nearly all sides cattle grazing on an open range
2a(1) : being in a position or adjustment to permit passage : not shut or locked an open door
(2) : having a barrier (such as a door) so adjusted as to allow passage the house was open
b : having the lips parted stood there with his mouth wide open
c : not buttoned or zipped an open shirt
3a : completely free from concealment : exposed to general view or knowledge their hostilities eventually erupted with open war
b : exposed or vulnerable to attack or question : subject open to doubt
c : being an operation or surgical procedure in which an incision is made such that the tissues are fully exposed
4a : not covered with a top, roof, or lid an open car her eyes were open
b : having no protective covering open wiring
5a : having the skin cracked, cut, or broken so that underlying tissue is exposed abrasions, lacerations, and other open wounds — see also open fracture
b of a head injury : marked by fracture or penetration of the skull
6 : not restricted to a particular group or category of participants open to the public open housing : such as
a : enterable by both amateur (see amateur sense 1) and professional (see professional entry 1 sense 2a) contestants an open tournament
b : enterable by a registered voter regardless of political affiliation an open primary
7 : fit to be traveled over : presenting no obstacle to passage or view the open road open country
8 : having the parts or surfaces laid out in an expanded position : spread out : unfolded an open book
9a(1) : low sense 13 an open vowel
(2) : formed with the tongue in a lower position Italian has an open and a close e
b(1) : having clarity and resonance unimpaired by undue tension or constriction of the throat an open vocal tone
(2) of a tone : produced by an open string or on a wind instrument by the lip without the use of slides, valves, or keys
10a : available to follow or make use of the only course open to us
b : not taken up with duties or engagements keep an hour open on Friday
c : not finally decided : subject to further consideration the salary is open an open question
d : available for a qualified applicant : vacant the job is still open
e : remaining available for use or filling until canceled an open order for more items
f : available for future purchase these items are in open stock
g : available for breeding : not now pregnant an open heifer
h computers : not proprietary : available to third party developers But while IBM pushes Notes, a proprietary technology created in the 1980s, a raft of new and much smaller rivals is plying the "open" technology of the 1990s: software on the World Wide Web, the fastest growing part of the Internet.— Bart Ziegler — compare open-source
11a : characterized by ready accessibility and usually generous attitude: such as
(1) : generous in giving
(2) : willing to hear and consider or to accept and deal with : responsive open to an offer open to suggestion
(3) : free from reserve or pretense : frank was open about his personal life
(4) of a relationship : not restricted to one partner at a time by mutual agreement — see also open marriage
b : accessible to the influx of new factors (such as foreign goods) an open market
12a : having openings, interruptions, or spaces open mesh : such as
(1) : being porous (see porous sense 2a) and friable open soil
(2) : sparsely distributed : scattered open population
(3) of a compound : having components (see component entry 1 sense 1) separated by a space in writing or printing (such as opaque projector)
b : not made up of a continuous closed circuit (see circuit entry 1 sense 2a) of channels the insect circulatory system is open
13a of an organ pipe : not stopped at the top
b of a string on a musical instrument : not stopped by the finger
14 : being in operation an open microphone especially : ready for business, patronage, or use the store is open from 9 to 5 the new highway will be open next week
15a(1) : characterized by lack of effective regulation of various commercial enterprises (see enterprise sense 2) an open town
(2) : not repressed (see repress sense 1) by legal controls open gambling
b : free from checking or hampering restraints an open economy
c : relatively unguarded by opponents passed to an open teammate
16 : having been opened by a first ante, bet, or bid the bidding is open
17 of punctuation : characterized by sparing use especially of the comma when possible without causing misinterpretation
18a : containing none of its endpoints an open interval
b : being a set or composed of sets each point of which has a neighborhood all of whose points are contained in the set the interior of a sphere is an open set
19a : being an incomplete electrical circuit
b : not allowing the flow of electricity an open switch
20 of a universe : having insufficient mass (see mass entry 2 sense 1c) to halt expansion gravitationally

open

verb
opened\ ˈō-​pənd , ˈō-​pᵊmd \; opening\ ˈōp-​niŋ , ˈō-​pə-​ \

Definition of open (Entry 2 of 3)

transitive verb

1a : to move (something, such as a door) from a closed position
b : to make available for entry or passage by turning back (something, such as a barrier) or removing (something, such as a cover or an obstruction)
2a : to make available for or active in a regular function open a new store
b : to make accessible for a particular purpose opened new land for settlement
c : to initiate access to (a computer file) prior to use
3a : to disclose or expose to view : reveal
b : to make more discerning or responsive : enlighten must open our minds to the problems
c : to bring into view or come in sight of by changing position
4a : to make an opening in opened the boil
b : to loosen and make less compact open the soil
5 : to spread out : unfold opened the book
6a : to enter upon : begin opened the meeting
b : to commence action in a card game by making (a first bid), putting a first bet in (the pot), or playing (a card or suit) as first lead
7 : to restore or recall (something, such as an order) from a finally determined state to a state in which the parties are free to prosecute or oppose

intransitive verb

1 : to become open the office opened early
2a : to spread out : expand the wound opened under the strain
b : to become disclosed a beautiful vista opened before us
3 : to become enlightened or responsive
4 : to give access the rooms open onto a hall
5 : speak out sense 2 finally he opened freely on the subject
6a : to begin a course or activity
b : to make a bet, bid, or lead in commencing a round or hand of a card game
7 : to provide the opening performance of a show before the main event

open

noun

Definition of open (Entry 3 of 3)

1 : opening
2 : open and unobstructed space: such as
a : open air
b : open water
3 : an open contest, competition, or tournament
4 : a public or unconcealed state or position

Keep scrolling for more

Other Words from open

Adjective

open adverb
openly \ ˈō-​pən-​lē \ adverb
openness \ ˈō-​pə(n)-​nəs \ noun

Verb

openability \ ˌōp-​nə-​ˈbi-​lə-​tē , ˌō-​pə-​ \ noun
openable \ ˈōp-​nə-​bəl , ˈō-​pə-​ \ adjective

Synonyms & Antonyms for open

Synonyms: Adjective

clear, cleared, free, unclogged, unclosed, unobstructed, unstopped

Synonyms: Verb

unclose

Synonyms: Noun

nature, open air, out-of-doors, outdoors, wild, wilderness

Antonyms: Adjective

blocked, clogged, closed, jammed, obstructed, plugged, shut, stopped, stuffed, uncleared

Antonyms: Verb

close, shut

Visit the Thesaurus for More 

Choose the Right Synonym for open

Adjective

frank, candid, open, plain mean showing willingness to tell what one feels or thinks. frank stresses lack of shyness or secretiveness or of evasiveness from considerations of tact or expedience. frank discussions candid suggests expression marked by sincerity and honesty especially in offering unwelcome criticism or opinion. a candid appraisal open implies frankness but suggests more indiscretion than frank and less earnestness than candid. open in saying what they think plain suggests outspokenness and freedom from affectation or subtlety in expression. plain talk

liable, open, exposed, subject, prone, susceptible, sensitive mean being by nature or through circumstances likely to experience something adverse. liable implies a possibility or probability of incurring something because of position, nature, or particular situation. liable to get lost open stresses a lack of barriers preventing incurrence. a claim open to question exposed suggests lack of protection or powers of resistance against something actually present or threatening. exposed to infection subject implies an openness for any reason to something that must be suffered or undergone. all reports are subject to review prone stresses natural tendency or propensity to incur something. prone to delay susceptible implies conditions existing in one's nature or individual constitution that make incurrence probable. very susceptible to flattery sensitive implies a readiness to respond to or be influenced by forces or stimuli. unduly sensitive to criticism

Examples of open in a Sentence

Adjective

The door suddenly swung open. You left the blinds wide open. The meat was roasted over an open fire. I was so tired that I couldn't keep my eyes open. Don't chew with your mouth open. staring with her eyes wide open There's already an open jar of pickles in the refrigerator. They kept the road open throughout the winter.

Verb

This door is hard to open. Open the door!” shouted the police officer. Would you mind if I opened a window? The car door opened and a beautiful woman stepped out. The door opened and closed so quietly that I didn't notice he had come in the room. This drawer is stuck. It just won't open! She comes home, turns on the TV, and starts opening her mail. She opened her eyes and smiled at me. I opened my umbrella and stepped out into the rain. Open your mouth wide for me,” said the dentist.

Noun

a daguerreotype of a cowboy whose face is roughened from a hard life in the open
See More

Recent Examples on the Web: Adjective

The remaining cell blocks are now open as a national monument, and worth a visit to understand a particularly brutal facet of the freedom struggle. Ella Riley-adams, Vogue, "Why India’s Andaman Islands Could Be the New Maldives," 4 Jan. 2019 The brand-new outpost is open and taking reservations for it's wine vault and restaurant. Sara Rodrigues, House Beautiful, "Restoration Hardware's New California Compound Is A Wine Lover's Dream," 2 Jan. 2019 Lofts are open, airy, and spacious by their very nature, but this rentable two-bedroom apartment-meets-showroom in Copenhagen manages to bring the two concepts together with ample style. Liz Stinson, Curbed, "Rent this cozy loft that doubles as a furniture showroom," 27 Dec. 2018 Because national parks are overseen by the Department of Interior, which is still waiting for funding, they are expected to be open but experience limited operations, for example. Li Zhou, Vox, "Wednesday is day 5 of a partial government shutdown. It could go on for a while.," 26 Dec. 2018 Menzies, while busy with new projects like The Crown, seems open to the idea of returning to the show in some capacity. Caroline Hallemann, Town & Country, "What Tobias Menzies's Return to Outlander Reveals About Frank Randall," 17 Dec. 2018 The state doesn't publicize how many are open, and most owners keep a much lower profile than Hof. Fox News, "Dennis Hof, Nevada brothel owner, dead at 72," 16 Oct. 2018 Some national parks may still be open to visitors, but workers will stop providing visitor services, including trash collection, campground operations and road maintenance. Kate Davidson, WSJ, "Shutdown’s Initial Impact Likely to Be Minor," 22 Dec. 2018 Push Broccolini over to one side slightly and spread panko in the open space. Woman's Day Kitchen, Woman's Day, "Creamy Broccolini Pasta with Chile Breadcrumbs," 19 Dec. 2018

Recent Examples on the Web: Verb

Among the new shops opening is Café Con Libros, a feminist bookstore in Brooklyn owned by an Afro-Latinx woman. Eric Ginsburg, Teen Vogue, "These Heroes Are Saving Black Feminist Classics by Putting Them on Wheels," 8 Jan. 2019 In the heart of Hammersmith, owners Emily and Lawrence Hartley just opened Le Petit Citron, a perfect neighborhood bistro. Elizabeth Wellington, Vogue, "Where to Find London’s Hidden French Side," 7 Jan. 2019 Though the clip is new, Entertainment Weekly had previously reported that the new season of Game of Thrones would open in Winterfell. Samantha Leach, Glamour, "New 'Game of Thrones' Clip Shows Sansa and Daenerys Meeting for the First Time," 6 Jan. 2019 As Season 4 opens, the Frasers are happily reunited and settling into life in America in 1767. Julie Kosin, Harper's BAZAAR, "Caitriona Balfe Is Evolving with Outlander," 31 Dec. 2018 Candidates serve for life — which, given modern longevity and youthful nominees, can now mean 40 years of decisions — and no one knows when the next seat will open. Ezra Klein, Vox, "Ruth Bader Ginsburg and the case for 18-year Supreme Court terms," 26 Dec. 2018 But as travelers are now beginning to discover, Namibia is one of Africa’s most fascinating destinations, with smart new lodges and camps opening every year. Stanley Stewart, Condé Nast Traveler, "Going Off-Grid in Namibia," 21 Dec. 2018 And although the initial boot time will take some time, Microsoft will freeze the state of the VM, post-boot, and refer to it when opening future instances of Sandbox—reducing that boot time significantly. Mark Hachman, PCWorld, "Microsoft announces Windows Sandbox, a virtualized safe space for testing untrusted apps," 19 Dec. 2018 The pilot episode opens just before half-human, half-witch Sabrina Spellman (Kiernan Shipka, Mad Men) turns sweet sixteen (on Halloween, of course). Jennifer Ouellette, Ars Technica, "Chilling Adventures of Sabrina," 18 Dec. 2018

Recent Examples on the Web: Noun

The whole space has an open, flowing layout, to encourage seamless wandering. Elise Taylor, Vogue, "A First Look at the Faena Bazaar, Miami Beach’s New Design Destination," 3 Dec. 2018 The Ropes Mansion is open between 12 p.m.-4 p.m. on weekends from May through late October. Alyssa Fiorentino, House Beautiful, "You Need To Know The Real Story Behind Allison's House From Hocus Pocus," 17 Oct. 2018 In the show's cold open, Kimmel presented Daniels with a Donald Trump puppet and urged her to show what Trump had done with it. Kelly Lawler, USA TODAY, "Stormy Daniels doesn't confirm or deny alleged Trump affair on 'Kimmel'," 31 Jan. 2018 In contrast to Carlsen’s noted ability to finish off end games, Caruana is said to intensely focus on the opens and search for an early edge. Andrew Beaton, WSJ, "Magnus Carlsen vs. the American in a Chess Championship for the Ages," 9 Nov. 2018 The Fake News Media, the true Enemy of the People, must stop the open & obvious hostility & report the news accurately & fairly. Stavros Agorakis, Vox, "Poll: GOP voters blame news for division in America; Democrats blame Trump," 1 Nov. 2018 Eat it here: Superdawg in Chicago (open until 1 a.m.); Curry 36 in Berlin (open until 5 a.m.); Bæjarins Beztu Pylsur in Reykjavík (open until 1 a.m.). Cnt Editors, Condé Nast Traveler, "A Debatable Encyclopedia of Drunk Food," 1 Oct. 2018 The Spy Who Loved Me’ In one of the most iconic cold opens of the franchise, 007 takes out a handful of would-be assassins while swooshing down the Austrian Alps. WSJ, "A Nearly Nude Take on James-Bond Style," 6 July 2018 The change will take effect before the open of trading next Tuesday. Bloomberg, latimes.com, "Dow Jones industrial average is dumping General Electric and adding Walgreens," 19 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'open.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of open

Adjective

before the 12th century, in the meaning defined at sense 1

Verb

before the 12th century, in the meaning defined at transitive sense 1a

Noun

13th century, in the meaning defined at sense 1

History and Etymology for open

Adjective, Verb, and Noun

Middle English, from Old English; akin to Old High German offan open, Old English ūp up

Keep scrolling for more

Learn More about open

Statistics for open

Last Updated

10 Jan 2019

Look-up Popularity

Time Traveler for open

The first known use of open was before the 12th century

See more words from the same century

Keep scrolling for more

More Definitions for open

open

noun

Financial Definition of open

What It Is

In the stock markets, open refers to the beginning of the trading day or the price of a security at the beginning of the trading day.

How It Works

The New York Stock Exchange has the most famous opening bell. At 9:30 am Eastern time, it rings. At that time, the last trading price for each security on the exchange the day before (the closing price) becomes the opening price, or the open.

Why It Matters

The open is the start of a new day, though it is important to note that that doesn't necessarily mean trading hasn't been going on right before the open. After-hours markets remain open as do other exchanges in other countries and time zones, which provides opportunity for the price to change right up until the open in many cases.

Source: Investing Answers

open

verb

English Language Learners Definition of open

 (Entry 1 of 2)

: to move (a door, window, etc.) so that an opening is no longer covered

: to move and no longer cover an opening

: to cause (something) to no longer be covered, sealed, or blocked

open

noun

English Language Learners Definition of open (Entry 2 of 2)

: a competition (such as a major golf tournament or tennis tournament) that allows both professionals and amateurs to participate

the open : an area or place without walls, barriers, etc. : an area or place that is not covered or enclosed

: a situation in which something (such as a feeling) is no longer hidden or kept secret

open

adjective
\ ˈō-pən \

Kids Definition of open

 (Entry 1 of 3)

1 : not shut or blocked : not closed an open window open books
2 : not sealed, locked, or fastened an open zipper There's an open bottle of ketchup in the refrigerator.
3 : easy to enter, get through, or see open country
4 : ready to consider appeals or ideas an open mind
5 : not drawn together : spread out an open flower open umbrellas
6 : not enclosed or covered an open boat an open fire
7 : not secret : public They have an open dislike for one another.
8 : to be used, entered, or taken part in by all an open meeting It was an open race—any number of dogs could be entered.— John Reynolds Gardiner, Stone Fox
9 : not decided or settled an open question

Other Words from open

openly adverb
openness noun

open

verb
opened; opening

Kids Definition of open (Entry 2 of 3)

1 : to change or move from a shut condition Sit down and open a book. The door opened. She opened her eyes.
2 : to clear by or as if by removing something in the way Workers were sent to open a road blocked with snow.
3 : to make or become ready for use They plan to open a store. The office opens at eight.
4 : to give access The rooms open onto a hall.
5 : begin sense 1, start Police have opened an investigation. They opened fire on the enemy.

Other Words from open

opener \ ˈō-​pə-​nər, ˈōp-​nər \ noun

open

noun

Kids Definition of open (Entry 3 of 3)

: space that is not enclosed or covered : outdoors Some slept in a cabin while others slept in the open.

Keep scrolling for more

open

adjective
\ ˈō-pən \

Medical Definition of open

 (Entry 1 of 2)

1a : not covered, enclosed, or scabbed over an open lesion an open running ulcer
b : not involving or encouraging a covering (as by bandages or overgrowth of tissue) or enclosure open treatment of burns
c : relating to or being a compound fracture
d : being an operation or surgical procedure in which an incision is made such that the tissues and organs are fully exposed — compare open-heart
2 : shedding the infective agent to the exterior open tuberculosis — compare closed sense 3
3a : unobstructed by congestion or occlusion open sinuses
b : not constipated open bowels
4 : using a minimum of physical restrictions and custodial restraints on the freedom of movement of the patients or inmates an open psychiatric ward

open

verb
opened; opening

Medical Definition of open (Entry 2 of 2)

transitive verb

1a : to make available for entry or passage by removing (as a cover) or clearing away (as an obstruction)
b : to free (a body passage) of congestion or occlusion an inhalator for opening congested nasal passages open clogged arteries
2 : to make one or more openings in opened the boil

intransitive verb

: to spread out the wound opened

open

adjective

Legal Definition of open

 (Entry 1 of 2)

1 : exposed to general view or knowledge : free from concealment an open, notorious, continuous, and adverse use of the property an open and obvious danger

Note: When a defect, hazard, or condition is open such that a reasonable person under the circumstances should have recognized the danger posed by it, a defendant is usually relieved of liability for failure to warn.

2 : not restricted to a particular group or category of participants specifically : enterable by a registered voter regardless of political affiliation an open primary
3a : being in effect or operation an open mine a bench warrant still open
b : available for use an open toll road
c : not finally determined, decided, or settled : subject to further consideration an open question
d : remaining effective or available for use until canceled an open insurance contract
4 : not repressed or regulated by legal controls a state with open gambling

open

verb
opened; opening

Legal Definition of open (Entry 2 of 2)

transitive verb

1 : to begin the process of open the succession
2a : to make the statement by which the trial of (a case) is begun and put before the court
b : to be the first to speak in summing up or arguing (a case)
3 : to restore or recall (as an order, rule, or judgment) from a finally determined state to a state in which the parties are free to prosecute or oppose by further proceedings

intransitive verb

1 : to begin action : commence on some course or activity the stock opened at par
2 : to begin the trial of a case defendant…has the option of presenting an opening statement immediately after plaintiff opens— J. H. Friedenthal et al.

Keep scrolling for more

More from Merriam-Webster on open

Thesaurus: All synonyms and antonyms for open

Spanish Central: Translation of open

Nglish: Translation of open for Spanish Speakers

Britannica English: Translation of open for Arabic Speakers

Comments on open

What made you want to look up open? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

means, resources, or money

Get Word of the Day daily email!

Test Your Vocabulary

Homophone Quiz

  • three-bears-two-of-them-look-like-theyre-whispering-to-a-third-bear-who-looks-chuffed-to-be-the-center-of-attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!