The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sennet \Sen"net\, n. (Zool.)
   The barracuda.
   [1913 Webster]