Source : Webster's Revised Unabridged Dictionary (1913)

Sennet \Sen"net\, n. [Properly, a sign given for the entrance or
   exit of actors, from OF. sinet, signet, dim. of signe. See
   {Signet}.]
   A signal call on a trumpet or cornet for entrance or exit on
   the stage. [Obs.]

Sennet \Sen"net\, n. (Zo["o]l.)
   The barracuda.