O / optīvus
adjective

optīvus

fem. optīva · neut. optīvum
chosen poetic
chosen (poet. and in post-class. prose): cognomen, Hor. Ep. 2, 2, 101: optivi vocantur hi (tutores) qui ex optione sumuntur, Gai. Inst. 1, 154 (opp. to dativi).