Source : Webster's Revised Unabridged Dictionary (1913)

Serenade \Ser`e*nade"\, v. t. [imp. & p. p. {Serenaded}; p. pr.
   & vb. n. {Serenading}.]
   To entertain with a serenade.

Serenade \Ser`e*nade"\, v. i.
   To perform a serenade.

Serenade \Ser`*enade"\, n. [F. s['e]r['e]nade, It. serenata,
   probably fr. L. serenus serene (cf. {Serene}), misunderstood
   as a derivative fr. L. serus late. Cf. {Soir['e]e}.] (Mus.)
   (a) Music sung or performed in the open air at nights; --
       usually applied to musical entertainments given in the
       open air at night, especially by gentlemen, in a spirit
       of gallantry, under the windows of ladies.
   (b) A piece of music suitable to be performed at such times.

Source : WordNet®

serenade
     n 1: a musical composition in several movements; has no fixed
          form [syn: {divertimento}]
     2: a song characteristically played outside the house of a
        woman
     v : sing and play for somebody; "She was serenaded by her
         admirers"