Adjective optimum has 1 sense
  1. optimum, optimal - most desirable possible under a restriction expressed or implied; "an optimum return on capital"; "optimal concentration of a drug"
    Antonym: worst (indirect, via best)
,Noun optimum has 1 sense
  1. optimum - most favorable condition or greatest degree or amount possible under given circumstances
    --1 is a kind of
    good, goodness
    Derived forms: verb optimize1, verb optimise1
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