The best or most favorable point, degree, amount, etc. The greatest degree or best result obtained or obtainable under specific conditions.
From L. optimum, neuter singular of optimus "best" (used as a suppletive superlative of bonus "good").
Behiné, from behin superlative of beh "good, fine" (Mid.Pers. veh "better, good;" O.Pers. vahav-, vahu-; Av. vah-, vohu- "good;" cf. Skt. vasu- "good;" Hittite wasu-; Gaulish vesus "good") + -in superlative suffix + -é nuance suffix.