The Collaborative International Dictionary of English v.0.48:
Serenata \Ser`e*na"ta\, Serenate \Ser"e*nate\, n. [It. serenata.
See Serenade.] (Mus.)
A piece of vocal music, especially one on an amoreus subject;
Or serenate, which the starved lover sings
To his pround fair. --Milton.
Note: The name serenata was given by Italian composers in the
time of Handel, and by Handel himself, to a cantata of
a pastoreal of dramatic character, to a secular ode,
etc.; also by Mozart and others to an orchectral
composition, in several movements, midway between the
suite of an earlier period and the modern symphony.