'question mark' definitions:

Definition of 'question mark'

From: WordNet
noun
A punctuation mark (?) placed at the end of a sentence to indicate a question [syn: question mark, interrogation point]

Definition of 'question mark'

From: GCIDE
  • Interrogation \In*ter`ro*ga"tion\, n. [L. interrogatio: cf. F. interrogation.] [1913 Webster]
  • 1. The act or process of interrogating or questioning; examination by questions; an instance of interrogating; inquiry. [1913 Webster]
  • 2. A question put; an inquiry. [1913 Webster]
  • 3. A point, mark, or sign, thus [?], indicating that the sentence with which it is connected is a question. It is used to express doubt, or to mark a query. Usually called a question mark; called also interrogation point. [1913 Webster +PJC]
  • Note: In works printed in the Spanish language this mark is not only placed at the end of an interrogative sentence, but is also placed, inverted [as thus ([iques])], at the beginning. [1913 Webster]

Synonyms of 'question mark'

From: Moby Thesaurus