1

in

preposition \ ˈin , ən , ᵊn \

Definition of in

1 a used as a function word to indicate inclusion, location, or position within limits
  • in the lake
  • wounded in the leg
  • in the summer
b :into 1
  • went in the house
2 used as a function word to indicate means, medium, or instrumentality
  • written in pencil
  • bound in leather
3 a used as a function word to indicate limitation, qualification, or circumstance
  • alike in some respects
  • left in a hurry
b :into 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

Examples of in in a Sentence

  1. Don't come in here with those muddy feet!

  2. drawn on the wall in crayon

Origin and Etymology of in

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

in Synonyms

Synonyms
by, per, through, via, with

2

in

adverb \ ˈin \

Definition of in

1 a (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
2 a :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

Examples of in in a Sentence

  1. She went in and closed the door.

  2. I lost my keys and now I can't get in.

  3. The burglars broke in through the kitchen window.

  4. The pool is deep. Be careful not to fall in.

  5. The boss called us in for a conference.

  6. The fog was closing in fast.

  7. Get your orders in early!

  8. Is the train in yet?

Recent Examples of in from the Web

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 12th century

in Synonyms


3

in

adjective \ ˈin \

Definition of in

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

Examples of in in a Sentence

  1. the in thing to do

  2. the in place to go

  3. It's what the in crowd is wearing this season.

Recent Examples of in from the Web

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

1599


4

in

noun \ ˈin \

Definition of in

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

Examples of in in a Sentence

  1. When you're trying to get started in show business, it helps to have an in.

  2. They must have an in with the boss.

Recent Examples of in from the Web

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

1764


5

in

abbreviation

Definition of in

1 inch
2 inlet

Other Weights and Measures Terms


In

symbol

Definition of In

indium

Other Chemical Engineering Terms


IN

abbreviation

Definition of IN

Indiana

1

in-

prefix
variants: or il- or im- or ir-

Definition of in-

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

Origin and Etymology of in-

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


2

in-

prefix
variants: or il- or im- or ir-

Definition of in-

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 :1en-
  • imbrute
  • imperil
  • inspirit

Origin and Etymology of in-

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


1

-in

noun suffix

Definition of -in

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

Origin and Etymology of -in

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


2

-in

noun combining form

Definition of -in

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

Origin and Etymology of -in

sit-in



IN Defined for English Language Learners

in

preposition

Definition of in for English Language Learners

  • —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

Definition of in for English Language Learners

  • : 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


in

adjective

Definition of in for English Language Learners

  • : popular or fashionable

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


in

noun

Definition of in for English Language Learners

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


IN Defined for Kids

1

in

preposition \ ˈin , ən \

Definition of in for Students

1 :located or positioned within
  • The house is in the country.
2 :into 1
  • We ran in the house.
3 :during
  • It's warmer in the summer.
4 :with 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 2
  • It broke in pieces.

2

in

adverb \ ˈin \

Definition of in for Students

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 :1near 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.

3

in

adjective \ ˈin \

Definition of in for Students

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

in.

abbreviation

Definition of in. for Students

inch

IN

abbreviation

Definition of IN for Students

Indiana

1

in-

prefix
variants: or il- or im- or ir-

Definition of in- for Students

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

2

in-

prefix
variants: or il- or im- or ir-

Definition of in- for Students

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- 2
  • imperil

Medical Dictionary

in

abbreviation

medical Definition of in

inch

In

symbol

medical Definition of In

indium

Law Dictionary

in

preposition

legal Definition of in

:under the law of :based on
  • brought an action in negligence
  • National Law Journal


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