Definition of cases:
(n) :
An actual event, situation, or fact.
(n) :
A piece of work, specifically defined within a profession; the set of tasks involved in addressing the situation of a specific person or event.
(n) :
(academia) An instance or event as a topic of study.
(n) :
(law) A legal proceeding; a lawsuit or prosecution.
(n) :
(grammar) A specific inflection of a word (particularly a noun, pronoun, or adjective) depending on its function in the sentence.
(n) :
(grammar, uncountable) Grammatical cases and their meanings taken either as a topic in general or within a specific language.