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.

Optative \Op"ta*tive\, n. [Cf. F. optatif.]
   1. Something to be desired. [R.] --Bacon.

   2. (Gram.) The optative mood; also, a verb in the optative
      mood.

Source : WordNet®

optative
     adj 1: indicating an option or wish
     2: relating to a mood of verbs in some languages; "optative
        verb endings"

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