Even salt is chemically broken down and rebuilt for optimum flavor.
The last two years was sort of the optimum personal fun, because we were the majority.
One reason for that is filmmakers shot with 16mm lenses on hand-cranked cameras for optimum authenticity.
1879, from Latin optimum, neuter singular of optimus "best" (used as a superlative of bonus "good"), probably related to ops "power, resources" (in which case the evolution is from "richest" to "the most esteemed," thus from PIE root *op- "to work") or to ob "in front of," with superlative suffix *-tumos. Originally in biology, in reference to "conditions most favorable" (for growth, etc.). As an adjective from 1885.