\ ˈin How to pronounce in (audio) , ən, ᵊn \

Definition of in

 (Entry 1 of 11)

1a used as a function word to indicate inclusion, location, or position within limits in the lakewounded in the legin the summer
b : into sense 1 went in the house
2 used as a function word to indicate means, medium, or instrumentality written in pencilbound in leather
3a used as a function word to indicate limitation, qualification, or circumstance alike in some respectsleft in a hurry
b : into sense 4a broke in pieces
4 used as a function word to indicate purpose said in reply
5 used as a function word to indicate the larger member of a ratio one in six is eligible


\ ˈin How to pronounce in (audio) \

Definition of in (Entry 2 of 11)

1a(1) : to or toward the inside especially of a house or other building come in
(2) : to or toward some destination or particular place flew in on the first plane
(3) : at close quarters : near play close in
b : so as to incorporate mix in the flour often used in combination built-in bookcases
c : to or at an appropriate place fit a piece in
2a : within a particular place especially : within the customary place of residence or business the doctor is in
b : in the position of participant, insider, or officeholder often used with on in on the joke
c(1) : on good terms
(2) : in a specified relation in bad with the boss
(3) : in a position of assured or definitive success
d : in vogue or season
e of an oil well : in production
f : in one's presence, possession, or control after the crops are in
g : from a condition of indistinguishability to one of clarity fade in
in for
: certain to experience in for a rude awakening
\ ˈin How to pronounce in (audio) \

Definition of in (Entry 3 of 11)

1a : that is located inside or within the in part
b : that is in position, operation, or power the in party
2 : that is directed or bound inward : incoming the in train
3a : extremely fashionable the in thing to do
b : keenly aware of and responsive to what is new and fashionable the in crowd


\ ˈin How to pronounce in (audio) \

Definition of in (Entry 4 of 11)

1 : one who is in office or power or on the inside a matter of ins versus outs
2 : influence, pull enjoyed some sort of in with the commandant— Henriette Roosenburg

Definition of in (Entry 5 of 11)

1 inch
2 inlet



Definition of In (Entry 6 of 11)


Definition of IN (Entry 7 of 11)

variants: or il- or im- or ir-

Definition of in- (Entry 8 of 11)

: not : non-, un- usually il- before l illogical , im- before b, m, or p imbalanceimmoralimpractical , ir- before r irreducible , and in- before other sounds inconclusive
variants: or il- or im- or ir-

Definition of in- (Entry 9 of 11)

1 : in : within : into : toward : on usually il- before l illuviation , im- before b, m, or p immingle , ir- before r irradiance , and in- before other sounds infiltrate
2 : en- entry 1 imbrute imperil inspirit

Definition of -in (Entry 10 of 11)

1a : neutral chemical compound insulin
b : enzyme pancreatin
c : antibiotic penicillin
2 : -ine entry 2 sense 1a epinephrin
3 : pharmaceutical product niacin

Definition of -in (Entry 11 of 11)

: organized public protest by means of or in favor of : demonstration teach-in love-in

Synonyms & Antonyms for in

Synonyms: Preposition

Synonyms: Adverb

Synonyms: Adjective

Synonyms: Noun

Antonyms: Adjective

Visit the Thesaurus for More 

Examples of in in a Sentence

Preposition Don't come in here with those muddy feet! drawn on the wall in crayon Adverb She went in and closed the door. I lost my keys and now I can't get in. The burglars broke in through the kitchen window. The pool is deep. Be careful not to fall in. The boss called us in for a conference. The fog was closing in fast. Get your orders in early! Is the train in yet? Adjective the in thing to do the in place to go It's what the in crowd is wearing this season. Noun When you're trying to get started in show business, it helps to have an in. They must have an in with the boss. See More
Recent Examples on the Web: Preposition In some cases, the families of private equity managers joined in. Brian Slodysko, BostonGlobe.com, 13 Aug. 2022 Jason Fagone is a narrative writer with The Chronicle, focusing on in-depth stories and investigations. Jason Fagone, San Francisco Chronicle, 13 Aug. 2022 In going through materials transferred from the White House in the chaotic final days of Trump’s presidency, officials had noticed that certain high-profile documents were missing. Devlin Barrett, Washington Post, 13 Aug. 2022 Peta Murgatroyd is pushing through a painful part of the in-vitro fertilization process. Angela Andaloro, Peoplemag, 12 Aug. 2022 Supplies will be distributed to pre-registered students and families first, though in-person registration will also be available. Chicago Tribune, 12 Aug. 2022 This is the first in-person shoe distribution since the pandemic began. Shelia Poole, ajc, 12 Aug. 2022 As a result, the movie closed in on that $2 billion mark during its theatrical run. Chris Smith, BGR, 12 Aug. 2022 Maui Brewing is acquiring Modern Times’ assets for $15.3 million following an auction in June. Mike Freeman, San Diego Union-Tribune, 12 Aug. 2022 Recent Examples on the Web: Adverb More trailers were coming in from western Kentucky, areas that were destroyed by tornadoes last year. Arkansas Online, 31 July 2022 Thirty-seven years later, the song beat its previous record, coming in at #4 on the Billboard Hot 100 and #1 on Billboard’s Global 200, surprising Bush herself with the level of enthusiasm from both older and younger generations. cleveland, 30 July 2022 Joanne is unhappy because her career has been sidelined, and one of my old pieces was still in there. Jazz Tangcay, Variety, 27 July 2022 Take a close look at your lease before signing to see if this clause is in there. Check those meters. Hanna Krueger, BostonGlobe.com, 26 July 2022 Hamlin, 41, and Busch, 37, had already completed the race, coming in at first and second place, when the drivers were informed of their violation. Natasha Dye, PEOPLE.com, 25 July 2022 And if the flow is right, then the emotion gets in there. Alessandro Corona, The Enquirer, 22 July 2022 Everyone's heard the myth that things can go missing in there. Corinne Sullivan, Woman's Day, 15 July 2022 His 10-year-old son and Uzi shared a room together but now, his son doesn’t want to be in there. Ellie Silverman, Washington Post, 13 July 2022 Recent Examples on the Web: Adjective Additionally, vendors should be able to demonstrate their work ethic by the working style and teamwork between the external staff and your in-house personnel. Thanh Pham, Forbes, 19 July 2022 The team also worked with Supermassive to line up objects on the set with their in-game locations using the stage’s gridded layout. Alyse Stanley, Washington Post, 28 June 2022 What subjects does Ortiz cover with his in-game banter? Globe Staff, BostonGlobe.com, 21 June 2022 Miami’s dominant first quarter on Saturday provided enough cushion to withstand Boston’s furious comeback and emotional in-game returns from Celtics players who had appeared to be seriously injured. New York Times, 22 May 2022 The value of its in-game currency SLP has dropped by 95% since last July. Grady Mcgregor, Fortune, 16 Apr. 2022 Yes, every Breakpoint NFT technically had a tiny, unique serial number engraved on its in-game model. Kyle Orland, Ars Technica, 6 Apr. 2022 Although his in-game return to the mound will be delayed, Mattson threw a bullpen Saturday, throwing 75% fastballs. Nathan Ruiz, baltimoresun.com, 16 Mar. 2022 With the expansion comes an all-in beverage program steered by new Kato partner Ryan Bailey. Los Angeles Times, 16 June 2022 Recent Examples on the Web: Noun Last month, student activists ended a monthlong sit-in, vowing to file a lawsuit of their own. Zachary Schermele, NBC News, 2 Aug. 2022 The Washington incumbents have largely avoided mentioning their votes to impeach Trump while on the campaign trail, opting instead to zero-in on local issues. Miles Cohen, ABC News, 2 Aug. 2022 These are great reasons to reach out to your prospects and offer congratulations, insights or just a friendly check-in. Expert Panel®, Forbes, 2 Aug. 2022 Pops of color enliven the gray-and-white wallpaper design, while a white built-in and a comfy gray couch ground the room. Caitlin Sole, Better Homes & Gardens, 1 Aug. 2022 The protesters appeared prepared for the long-haul – or at least an extended sit-in. The Christian Science Monitor, 1 Aug. 2022 Online and mail-in voting begins Sept. 1 and ends Sept. 15 at 5 p.m. ET. William Earl, Variety, 1 Aug. 2022 The experiments found that initiators significantly underestimated the recipient's reaction to the check-in. Rachel Fadem, CNN, 30 July 2022 As the lead-in for Metallica, Strings made perfect sense. Joshua Klein, Rolling Stone, 29 July 2022 See More

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

First Known Use of in


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


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


1599, in the meaning defined at sense 1a


1764, in the meaning defined at sense 1

History and Etymology for in


Middle English, from Old English; akin to Old High German in in, Latin in, Greek en

Prefix (1)

Middle English, from Anglo-French, from Latin; akin to Old English un-

Prefix (2)

Middle English, from Anglo-French, from Latin, from in in, into

Noun suffix

French -ine, from Latin -īna, feminine of -īnus of or belonging to — more at -en

Noun combining form


Learn More About in

Time Traveler for in

Time Traveler

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

See more words from the same century

Dictionary Entries Near in




See More Nearby Entries 

Statistics for in

Last Updated

16 Aug 2022

Cite this Entry

“In.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in. Accessed 16 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for in


\ ˈin How to pronounce in (audio) , ən \

Kids Definition of in

 (Entry 1 of 7)

1 : located or positioned within The house is in the country.
2 : into sense 1 We ran in the house.
3 : during It's warmer in the summer.
4 : with sense 2 I wrote in pencil.
5 used to show a state or condition You're in luck!We're in trouble.
6 used to show manner or purpose I'm in a hurry.He laughed in reply.
7 : into sense 2 It broke in pieces.


\ ˈin How to pronounce in (audio) \

Kids Definition of in (Entry 2 of 7)

1 : to or toward the inside I went in and closed the door.
2 : to or toward some particular place We flew in yesterday.
3 : near entry 1 sense 1 Play close in.
4 : into the midst of something Mix in the flour.
5 : to or at its proper place Can you fit this piece in?
6 : on the inner side : within Everyone is in.
7 : present and available for use All the votes are in.
in for
: sure to experience He was in for a surprise.


\ ˈin How to pronounce in (audio) \

Kids Definition of in (Entry 3 of 7)

1 : being inside or within the in part
2 : headed or bound inward the in train



Kids Definition of in.




Kids Definition of IN



variants: or il- or im- or ir-

Kids Definition of in-

 (Entry 1 of 7)

: not : non-, un- usually il- before l illogical , im- before b, m, or p immoralimpractical , ir- before r irreconcilable and in- before other sounds incomplete


variants: or il- or im- or ir-

Kids Definition of in- (Entry 2 of 7)

1 : in : within : into : toward : on usually il- before l illuminate , im- before b, m, or p import , ir- before r irradiate , and in- before other sounds infect
2 : en- sense 2 imperil



Medical Definition of in

 (Entry 1 of 2)




Medical Definition of In (Entry 2 of 2)




Legal Definition of in

: under the law of : based on brought an action in negligenceNational Law Journal

More from Merriam-Webster on in

Nglish: Translation of in for Spanish Speakers

Britannica English: Translation of in for Arabic Speakers

Britannica.com: Encyclopedia article about in


Test Your Vocabulary

Challenging Words You Should Know

  • hedgehog reading a book
  • Often used to describe “the march of time,” what does inexorable mean?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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