Question Mark Definition

noun
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.
Webster's New World
An unknown factor.
Webster's New World

(idiomatic) Doubt or uncertainty.

There's a question mark over whether or not he'll be fit for the next game.
Wiktionary
Attributive form of question mark.
Question-mark key.
Wiktionary
Synonyms:

Other Word Forms of Question Mark

Noun

Singular:
question mark
Plural:
question-marks

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question mark