Real Dictionary

-in in American English 1
a neutral carbohydrate
suffix: a suffix, occurring in adjectives of Greek and Latin origin, meaning “pertaining to,” and (in nouns thence derived) also imitated in English ( coffin; cousin, etc.)

-in in American English 2
any of various mass actions or gatherings of a (specified) type, as a political demonstration or a form of entertainment
suffix: a noun suffix used in a special manner in chemical and mineralogical nomenclature (glycerin; acetin, etc.). In spelling, usage wavers between -in and -ine. In chemistry a certain distinction of use is attempted, basic substances having the termination -in

-in in American English 3
suffix: a suffixal use of the adverb in, extracted from sit-in, forming compound nouns, usually from verbs, referring to organized protests through or in support of the named activity (kneel-in; chain-in; be-in) or, more generally, to any organized social or cult

-in in British English
suffix forming nouns: indicating a neutral organic compound, including proteins, glucosides, and glycerides

IN in American English
Indiana
abbreviation: Indiana (approved esp. for use with zip code)
the chemical symbol for: indium

In in American English 1
contained or enclosed by; inside; within
Indiana
preposition: (used to indicate inclusion within space, a place, or limits)

In in American English 2
inch(es)
indium
abbreviation: inch; inches

In in British English
abbreviation for: Indiana
the chemical symbol for: indium

in in British English 1
preposition: inside; within

in in British English 2
the internet domain name for: India

in inclusion or involvement
preposition: If something is in a book, film, play, or picture, you can read it or see it there.

in other uses and phrases
You use in with a present participle to indicate that when you do something, something else happens as a result.
adjective: If you say that something is in, or is the in thing, you mean it is fashionable or popular.

in position or movement
preposition: If something happens in a place, it happens there.
preposition: Someone or something that is in something else is enclosed by it or surrounded by it. If you put something in a container, you move it so that it is enclosed by the container.

in states and qualities
preposition: If something or someone is in a particular state or situation, that is their present state or situation.
preposition: You use in to indicate the feeling or desire which someone has when they do something, or which causes them to do it.

in time and numbers
preposition: If something happens in a particular situation, it happens while that situation is going on.
preposition: If something happens in a particular year, month, or other period of time, it happens during that time.

in-
prefix: In- is added to some words to form words with the opposite meaning. For example, something that is incorrect is not correct.

in- in American English 1
in, into, within, on, toward
prefix: a prefix representing English in (income; indwelling; inland, etc.), but used also as a verb-formative with transitive, intensive, or sometimes little apparent force (intrust; inweave, etc.). It often assumes the same forms as in-2, such as , en-1, em-1,

in- in American English 2
no, not, without, non- [ insignificant]
prefix: a prefix of Latin origin meaning primarily “in,” but used also as a verb-formative with the same force as in-1

in- in American English 3
prefix: a prefix of Latin origin, corresponding to English un-, having a negative or privative force, freely used as an English formative, esp. of adjectives and their derivatives and of nouns (inattention; indefensible; inexpensive; inorganic; invariable). It as

in- in British English 1
prefix: not; non-

in- in British English 2
prefix: in; into; towards; within; on

in.
in. is a written abbreviation for inch. The plural can be 'in.' or 'ins'.

in. in British English
abbreviation for: inch(es)