Question-mark definition

A punctuation symbol (?) written at the end of a sentence or phrase to indicate a direct question.
noun
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A mark of punctuation (?) put after a sentence, word, etc. to indicate a direct question, and also used to express doubt, uncertainty, etc.; interrogation mark.
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Something that is unknown, mysterious, or doubtful.

Which players will still be on the team next year remains a question mark.

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An unknown factor.
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In C programming, the question mark is used as a conditional symbol. For example, in the expression x1 ? x2 : x3, if x1 is not zero, then x2 is evaluated, otherwise x3 is evaluated.
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The punctuation mark “?", used at the end of a sentence to indicate a question.
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(idiomatic) Doubt or uncertainty.

There's a question mark over whether or not he'll be fit for the next game.

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Attributive form of question mark.

Question-mark key.

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Other Word Forms

Noun

Singular:
question-mark
Plural:
question-marks