The Collaborative International Dictionary of English v.0.48:

Coda \Co"da\ (k[=o]"d[.a]), n. [It., tail, fr. L. cauda.] (Mus.)
   A few measures added beyond the natural termination of a
   composition.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coda
    n 1: the closing section of a musical composition [syn:
         finale, coda]