The Collaborative International Dictionary of English v.0.48:

Mock \Mock\, v. t. [imp. & p. p. Mocked; p. pr. & vb. n.
   Mocking.] [F. moquer, of uncertain origin; cf. OD. mocken
   to mumble, G. mucken, OSw. mucka.]
   1. To imitate; to mimic; esp., to mimic in sport, contempt,
      or derision; to deride by mimicry.
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            To see the life as lively mocked as ever
            Still sleep mocked death.             --Shak.
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            Mocking marriage with a dame of France. --Shak.
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   2. To treat with scorn or contempt; to deride.
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            Elijah mocked them, and said, Cry aloud. --1 Kings
                                                  xviii. 27.
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            Let not ambition mock their useful toil. --Gray.
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   3. To disappoint the hopes of; to deceive; to tantalize; as,
      to mock expectation.
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            Thou hast mocked me, and told me lies. --Judg. xvi.
                                                  13.
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            He will not . . .
            Mock us with his blest sight, then snatch him hence.
                                                  --Milton.
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   Syn: To deride; ridicule; taunt; jeer; tantalize; disappoint.
        See Deride.
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The Collaborative International Dictionary of English v.0.48:

Mocking \Mock"ing\, a.
   Imitating, esp. in derision, or so as to cause derision;
   mimicking; derisive.
   [1913 Webster]

   Mocking thrush (Zool.), any species of the genus
      Harporhynchus, as the brown thrush (Harporhynchus
      rufus).

   Mocking wren (Zool.), any American wren of the genus
      Thryothorus, esp. Thryothorus Ludovicianus.
      [1913 Webster] mockingbird

WordNet (r) 3.0 (2006):

mocking
    adj 1: abusing vocally; expressing contempt or ridicule;
           "derisive laughter"; "a jeering crowd"; "her mocking
           smile"; "taunting shouts of `coward' and `sissy'" [syn:
           derisive, gibelike, jeering, mocking, taunting]
    2: playfully vexing (especially by ridicule); "his face wore a
       somewhat quizzical almost impertinent air"- Lawrence Durrell
       [syn: mocking, teasing, quizzical]