question mark ques·tion·mark US/ˈkwɛstʃʌˈnmɑrk/ uncommon noun 1. a punctuation mark (?) placed at the end of a sentence to indicate a question Synonymsquestion markinterrogation point Related words Broader terms punctuation WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.
