from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A punctuation symbol (?) written at the end of a sentence or phrase to indicate a direct question. Also called interrogation point.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The punctuation mark “?”, used at the end of a sentence to indicate a question.
  • n. doubt or uncertainty

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a punctuation mark (?) placed at the end of a sentence to indicate a question


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