The Collaborative International Dictionary of English v.0.48:

Semantic \Sem*an"tic\, Semantical \Sem*an"tic*al\, n. sing. or
   pl. [Gr. shmantikos having meaning, from sh^ma a sign.]
   1. pertaining to the meanings of words.
      [PJC]

   2. of or pertaining to semantics.
      [PJC]