A question mark is the punctuation mark ? which is used in writing at the end of a question.
2. countable noun
If there is doubt or uncertainty about something, you can say that there is a question markover it.
There are bound to be question marks over his future. [+ over]
There's now a huge question mark hanging over the success of the negotiations.
English Easy Learning GrammarThe question mark ( ? )The question mark marks the end of a question. When will we be arriving? Why did you do that? Does any of this matter? He’s certain to be elected, isn’t ... Read more
question mark in British English
noun
1.
the punctuation mark ?, used at the end of questions and in other contexts where doubt or ignorance is implied
2.
this mark used for any other purpose, as to draw attention to a possible mistake, as in a chess commentary
3.
an element of doubt or uncertainty
question mark in American English
1.
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
2. US
an unknown factor
Examples of 'question mark' in a sentence
question mark
Working swiftly, Pete made an enormous blue question mark, at least a yard high, on the dirty white face of the theatre.
Arthur, Robert THREE IN ONE (1990)
Snoot shrugged his shoulders to Walker, a question mark across his grin.
Metz, Don KING OF THE MOUNTAIN (1990)
In other languages
question mark
British English: question mark /ˈkwɛstʃən mɑːk/ NOUN
A question mark is the punctuation mark (?) which is used in writing at the end of a question.
He put a question mark next to her name on the list.