\ˈin, 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 2a 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

in

adverb
\ˈin \

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 \

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

c : inside sense 2

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

in

noun
\ˈin \

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

in

abbreviation (1)

Definition of in (Entry 5 of 11)

1 inch

2 inlet

In

symbol

Definition of In (Entry 6 of 11)

indium

IN

abbreviation (2)

Definition of IN (Entry 7 of 11)

Indiana

in-

prefix (1)
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

in-

prefix (2)
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

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Synonyms & Antonyms for in

Synonyms: Preposition

by, per, through, via, with

Synonyms: Adverb

around, by, close, hard, near, nearby, nigh

Synonyms: Adjective

à la mode (also a la mode), au courant, chic, cool [slang], exclusive, fashionable, fresh [slang], happening, hip, modish, sharp, smart, snappy, stylish, supercool, swell, swish, trendy, voguish

Synonyms: Noun

authority, clout, credit, heft, influence, juice [slang], leverage, pull, sway, weight

Antonyms: Adjective

dowdy, out, outmoded, styleless, unchic, uncool, unfashionable, unmodish, unstylish

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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.
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Recent Examples on the Web: Adverb

To be most effective, use interconnected alarms so that if one starts wailing, the rest join in. Carolyn L. Todd, SELF, "Emergency Responders Share 9 of the Biggest Death Traps in Your Home," 14 July 2018 Archie Bradley wasn’t at his best, but Andrew Chafin bailed him out and got four outs in all. Nick Piecoro, azcentral, "Diamondbacks taxing bullpen but still getting results," 11 July 2018 Garcia said after that, his department had a back-and-forth challenge with the San Antonio Police Department, and other agencies in Texas began to join in. Asia Fields, The Seattle Times, "Lip-syncing cops in Virginia challenge Seattle police in viral video," 10 July 2018 The 19-year-old shortstop drove in all of Double-A San Antonio’s runs in Monday’s 8-3 loss at Arkansas via his 15th homer, one off the league lead. Jeff Sanders, sandiegouniontribune.com, "Tatis swats 15th homer with Missions; July 2 signing period opens," 3 July 2018 The fest includes The Happy Lobster, The Fat Shallot, The Dapper Doughnut and many other food trucks — more than 40 in all. Adam Lukach, RedEye Chicago, "5 things to do this weekend in Chicago," 21 June 2018 Prescription opioid distribution declined in all but one state — Idaho — with the greatest declines in states that limit how much doctors can prescribe. Sarah Gantz, Philly.com, "Prescription opioid distribution drops in Pa., N.J.," 19 June 2018 The 90kWh lithium-ion battery pack is made from pouch cells with 432 of them in all. Jonathan M. Gitlin, Ars Technica, "Forget about that Tesla—the Jaguar I-Pace is the most compelling EV yet," 14 June 2018 But hidden in all that messy stuff were nine strikeouts. Robert Avery, Houston Chronicle, "Memorial ties Texas City in nightcap of twinbill," 6 June 2018

Recent Examples on the Web: Adjective

Andre Roberson's injury has hurt them worse than anyone could have imagined, and suddenly the all-in bet on one year of George is becoming a more sobering proposition. Andrew Sharp, SI.com, "The Year of Stress in the Western Conference," 9 Mar. 2018 But this latest test suggests that the United States may already be in range as well, and that, as one former top American intelligence official noted recently, would put enormous pressure on American missile defenses that few trust to work. Chris Stirewalt, Fox News, "Trump looks east for new foreign policy," 5 July 2017 But this latest test suggests that the United States may already be in range as well, and that, as one former top American intelligence official noted recently, would put enormous pressure on American missile defenses that few trust to work. David E. Sanger, New York Times, "What Can Trump Do About North Korea? His Options Are Few and Risky," 4 July 2017

Recent Examples on the Web: Noun

Check-in will begin at 7:45 a.m. The event includes Mass, small and large group discussion, breakfast and lunch, among other activities. Staff Report, Post-Tribune, "Church news," 13 July 2018 Members of the program go through a six month program that includes daily check-ins with a case manager, getting a job and obtaining a driver’s license. Washington Post, "Young California mayor sees value in paying poor to rise up," 10 July 2018 Members of the program go through a six month program that includes daily check-ins with a case manager, getting a job and obtaining a driver’s license. Kathleen Ronayne, The Seattle Times, "Young California mayor sees value in paying poor to rise up," 10 July 2018 The lawsuit alleges Motel 6 had a corporate policy or practice of giving U.S. Immigration and Customs Enforcement agents information that guests provided at check-in. Jacques Billeaud, azcentral, "Motel 6 to settle claim workers gave guest info to ICE," 9 July 2018 Check-in begins at 5:45 p.m.; dinner at 6:30; rides open through 9 p.m. Check out between 8 and 8:30 a.m. 5:45-p.m. SFChronicle.com, "Kids listings," 5 July 2018 At check-in, the genuinely friendly staff welcomed us with a choice of beverages and healthy snacks, which are complimentary for guests throughout their stay. Joanne Dibona, sandiegouniontribune.com, "Boise trip is a capital idea," 5 July 2018 Seats are assigned upon check-in, and changeable for a fee (between $20 and $100, depending on the seat). Meredith Carey, Condé Nast Traveler, "International Basic Economy: How Every Major Airline Compares," 5 July 2018 Some are scarier, meriting check-ins to the hospital or legal wranglings. Aarian Marshall, WIRED, "A Cruise-on-Cruise Crash Reveals the Hardest Thing About Self-Driving Tech," 3 July 2018

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.

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First Known Use of in

Preposition

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

Adverb

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

Adjective

1599, in the meaning defined at sense 1a

Noun

1764, in the meaning defined at sense 1

History and Etymology for in

Preposition

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

sit-in

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Learn More about in

Dictionary Entries near in

impx

imu

I must love you and leave you

in

-in

IN

in-

Statistics for in

Look-up Popularity

Time Traveler for in

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

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More Definitions for in

English Language Learners Definition of in

 (Entry 1 of 4)

—used to indicate location or position within something

: to the inside of (a room, container, etc.)

—used to indicate that someone or something belongs to or is included as part of something

in

adverb

English Language Learners Definition of in (Entry 2 of 4)

: to or toward the inside of something (such as a building)

: to or toward a place

: at the place where someone or something arrives after traveling

English Language Learners Definition of in (Entry 3 of 4)

: popular or fashionable

: aware of and strongly influenced by what is new and fashionable

in

noun

English Language Learners Definition of in (Entry 4 of 4)

: a way of becoming involved in something or of influencing someone

\ˈin, 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.

in

adverb
\ˈin \

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 \

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.

inch

Kids Definition of IN

Indiana

in-

prefix
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

in-

prefix
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)

inch

In

symbol

Medical Definition of In (Entry 2 of 2)

indium

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Legal Definition of in 

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

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Comments on in

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