Association

from Wikipedia:

Association may refer to:

Voluntary associations, groups of individuals who voluntarily enter into an agreement to accomplish a purpose 501(c) non-profit organizationAlumni association, an association of former students of a college or universityProfessional associationSports associationTrade association, another name of an industry trade groupFile association, indicating the type of file the extension refers to and program to be

used to open it.

Associations in various fields of study:

Archaeological association, in archaeology, the relationship between objects found togetherAssociation (astronomy), combined or co-added group of astronomical exposuresAssociation (chemistry)Association (ecology)Association (object-oriented programming), a kind of grouping in object-oriented programmingAssociation (psychology), a connection between two or more concepts in the mind or imaginationAssociation (statistics)Free association of producers, the goal of anarchists and communists

Names of particular entities or things:

Continental Association, often called the "Association", an economic boycott during the American RevolutionHMS Association (1697), a Royal Navy ship which sank in 1707L'Association, a French comic book publisherThe Association, a pop band