Source : Webster's Revised Unabridged Dictionary (1913)

Flotilla \Flo*til"la\, n. [Sp. flotilla, dim. of flota fleet;
   akin to F. flotte, It. flotta, and F. flot wave, fr. L.
   fluctus, but prob. influenced by words akin to E. float. See
   {Fluctuate}, and cf. {Float}, n.]
   A little fleet, or a fleet of small vessels.

Source : WordNet®

flotilla
     n 1: a United States Navy fleet consisting of two or more
          squadrons of small warships
     2: a fleet of small craft