question mark
US /ˈkwes.tʃən ˌmɑːrk/
UK /ˈkwes.tʃən ˌmɑːrk/
1.
a punctuation mark (?) indicating an interrogative expression or question
:
•
Always end a direct question with a question mark.
•
He wrote a sentence with a missing question mark.
2.
a matter of doubt or uncertainty
:
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His future with the company is a big question mark.
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The success of the new project remains a question mark.