(grammar) A mode of inflection of a word dependent on its use, especially the syntactic function in a phrase.

(grammar) A case used to mark a likeness to something, or that two things have the same quantity of something. It corresponds roughly to the English adverb "like". Languages that use the comparative case include Mari, Nivkh, and Chechen.

(grammar) A case of second objects, being a derivation of the comparative case but intended for larger, more substantial objects, and used to join or combine one thing with another. It corresponds roughly to a variation of the accusative case: I understood him (him in the substantive case rather than the accusative, since no action is performed on the object). Languages that use the substantive case include Chechen and Ingush.

(slang) An insane or eccentric person who has little grip on reality.

(grammar) A special form of the prolative case used to describe movement along a surface or way.

plural of case ending

(epidemiology) The first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation; the case of patient zero.

As is appropriate to the circumstances; particularly where a choice must be made between two options.

a class of phenomena that is a subset of a more general class / a theorem or other statement that follows directly from a more general statement

(transitive, intransitive, chiefly programming) To treat something as a special case; to handle in an explicitly different way.