Source : Webster's Revised Unabridged Dictionary (1913)

Regatta \Re*gat"ta\ (r?*g?t"t?), n.; pl. {Regattas} (-t?z). [It.
   regatta, regata.]
   Originally, a gondola race in Venice; now, a rowing or
   sailing race, or a series of such races.

Source : WordNet®

regatta
     n : a meeting for boat races