The Collaborative International Dictionary of English v.0.48:

Quiz \Quiz\ (kw[i^]z), n. [It is said that Daly, the manager of
   a Dublin playhouse, laid a wager that a new word of no
   meaning should be the common talk and puzzle of the city in
   twenty-four hours. In consequence of this the letters q u i z
   were chalked by him on all the walls of Dublin, with an
   effect that won the wager. Perhaps, however, originally a
   variant of whiz, and formerly the name of a popular game.]
   1. A riddle or obscure question; an enigma; a ridiculous
      hoax.
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   2. One who quizzes others; as, he is a great quiz.
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   3. An odd or absurd fellow. --Smart. Thackeray.
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   4. An exercise, or a course of exercises, conducted as a
      coaching or as an examination. [Cant, U.S.]
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The Collaborative International Dictionary of English v.0.48:

Quiz \Quiz\ (kw[i^]z), v. t. [imp. & p. p. Quizzed (kw[i^]zd);
   p. pr. & vb. n. Quizzing (kw[i^]z"z[i^]ng).]
   1. To puzzle; to banter; to chaff or mock with pretended
      seriousness of discourse; to make sport of, as by obscure
      questions.
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            He quizzed unmercifully all the men in the room.
                                                  --Thackeray.
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   2. To peer at; to eye suspiciously or mockingly.
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   3. To instruct in or by a quiz. See Quiz, n., 4. [U.S.]
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   Quizzing glass, a small eyeglass.
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The Collaborative International Dictionary of English v.0.48:

Quiz \Quiz\ (kw[i^]z), v. i.
   To conduct a quiz. See Quiz, n., 4. [U.S.]
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WordNet (r) 3.0 (2006):

quiz
    n 1: an examination consisting of a few short questions
    v 1: examine someone's knowledge of something; "The teacher
         tests us every week"; "We got quizzed on French irregular
         verbs" [syn: quiz, test]