An expression of inquiry that invites or calls for a reply. An interrogative sentence, phrase, or gesture. A subject or point open to controversy; an issue. A difficult matter; a problem: a question of ethics. A point or subject under discussion or consideration. A proposition brought up for consideration by an assembly. The act of bringing a proposal to vote. Uncertainty; doubt: There is no question about the validity of the enterprise. To put a question to. See Synonyms at ask. To examine (a witness, for example) by questioning; interrogate. To express doubt about; dispute. To analyze; examine. To ask questions. in question Under consideration or discussion. out of the question Not worth considering; impossible: Starting over is out of the question.