Meaning

adjective most desirable possible under a restriction expressed or implied

originEtymology tree Proto-Indo-European *h₁ep-der. Proto-Indo-European *h₁épsder. Proto-Indo-European *h₁epi Proto-Indo-European *-tm̥mos ? Latin optimus Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English optimal From Latin optimus + English -al.

Etymology from Wiktionary, CC BY-SA 3.0