The Collaborative International Dictionary of English v.0.48:

Medley \Med"ley\, n.; pl. Medleys. [OE. medlee, OF. mesl['e]e,
   medl['e]e, mell['e]e, F. m[^e]l['e]e. See Meddle, and cf.
   Mel['e]e, Mellay.]
   1. A mixture; a mingled and confused mass of ingredients,
      usually inharmonious; a jumble; a hodgepodge; -- often
      used contemptuously.
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            This medley of philosophy and war.    --Addison.
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            Love is a medley of endearments, jars,
            Suspicions, reconcilements, wars.     --W. Walsh.
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   2. The confusion of a hand to hand battle; a brisk, hand to
      hand engagement; a m[^e]l['e]e. [Obs.] --Holland.
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   3. (Mus.) A composition of passages detached from several
      different compositions; a potpourri.
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   Note: Medley is usually applied to vocal, potpourri to
         instrumental, compositions.
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   4. A cloth of mixed colors. --Fuller.
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The Collaborative International Dictionary of English v.0.48:

Medley \Med"ley\, a.
   1. Mixed; of mixed material or color. [Obs.] "A medl['e]
      coat." --Chaucer.
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   2. Mingled; confused. --Dryden.
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WordNet (r) 3.0 (2006):

medley
    n 1: a musical composition consisting of a series of songs or
         other musical pieces from various sources [syn: medley,
         potpourri, pastiche]