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From The Collaborative International Dictionary of English v.0.48:
Optative \Op"ta*tive\, a. [L. optativus: cf. F. optatif.] Expressing desire or wish. --Fuller. [1913 Webster] Optative mood (Gram.), that mood or form of a verb, as in Greek, Sanskrit, etc., in which a wish or desire is expressed. [1913 Webster]