Source : Webster's Revised Unabridged Dictionary (1913)

Optative \Op"ta*tive\, a. [L. optativus: cf. F. optatif.]
   Expressing desire or wish. --Fuller.

   {Optative mood} (Gram.), that mood or form of a verb, as in
      Greek, Sanskrit, etc., in which a wish or desire is
      expressed.

Source : WordNet®

optative mood
     n : a mood (as in Greek or Sanskrit) that expresses a wish or
         hope; expressed in English by modal verbs [syn: {optative}]