belonging equally to, or shared alike by, two or more or all in question

common property; common interests.

pertaining or belonging equally to an entire community, nation, or culture; public

a common language or history; a common water-supply system.

joint; united

a common defense.

widespread; general; ordinary

common knowledge.

of frequent occurrence; usual; familiar

a common event; a common mistake.

hackneyed; trite.

of mediocre or inferior quality; mean; low

a rough-textured suit of the most common fabric.

coarse; vulgar

common manners.

lacking rank, station, distinction, etc.; unexceptional; ordinary

a common soldier; common people; the common man; a common thief.

Dialect . friendly; sociable; unaffected.

Anatomy . forming or formed by two or more parts or branches

the common carotid arteries.

Prosody . (of a syllable) able to be considered as either long or short.

Grammar .

not belonging to an inflectional paradigm; fulfilling different functions that in some languages require different inflected forms

English nouns are in the common case whether used as subject or object.

constituting one of two genders of a language, esp. a gender comprising nouns that were formerly masculine or feminine

Swedish nouns are either common or neuter.

noting a word that may refer to either a male or a female

French élève has common gender. English lacks a common gender pronoun in the third person singular.

(of a noun) belonging to the common gender.

Mathematics . bearing a similar relation to two or more entities.

of, pertaining to, or being common stock

common shares.

Often, commons. Chiefly New England . a tract of land owned or used jointly by the residents of a community, usually a central square or park in a city or town.

Law . the right or liberty, in common with other persons, to take profit from the land or waters of another, as by pasturing animals on another's land (common of pasturage) or fishing in another's waters (common of piscary).

commons, ( used with a singular or plural verb )

the commonalty; the nonruling class.

the body of people not of noble birth or not ennobled, as represented in England by the House of Commons.

( initial capital letter ) the representatives of this body.

( initial capital letter ) the House of Commons.

commons,

( used with a singular verb ) a large dining room, esp. at a university or college.

( usually used with a plural verb ) British . food provided in such a dining room.

( usually used with a plural verb ) food or provisions for any group.

( sometimes initial capital letter ) Ecclesiastical .

an office or form of service used on a festival of a particular kind.

the ordinary of the Mass, esp. those parts sung by the choir.

the part of the missal and breviary containing Masses and offices of those saints assigned to them.

Obsolete .

the community or public.

the common people. ?

in common

in joint possession or use; shared equally

They have a love of adventure in common.

noun

canteen , mess hall