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Entry 2 senses · 2 variants Webster, 1913

optimum

· IPA /ˈɑptɪməm/
01 adj. Best possible or most desirable; -- usually under a restriction expressed or implied; as, an optimum return on capital; optimum concentrati…
  1. 1.
    Best possible or most desirable; -- usually under a restriction expressed or implied; as, an optimum return on capital; optimum concentration of a drug; an optimum result.
Syn. optimal.
02 n. The most favorable condition, greatest degree, or largest amount possible under given circumstances.
  1. 1.
    The most favorable condition, greatest degree, or largest amount possible under given circumstances.