question mark

noun

: the punctuation mark ? that is used after a direct question or to indicate that something (such as a birth date) is uncertain

: someone or something that causes feelings of doubt or uncertainty

Full Definition of QUESTION MARK

a : something unknown, unknowable, or uncertain

b : someone (as an athlete) whose condition, talent, or potential for success is in doubt

: a mark ? used in writing and printing at the conclusion of a sentence to indicate a direct question

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QUESTION MARK Defined for Kids

noun

: a punctuation mark ? used chiefly at the end of a sentence to indicate a direct question

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