[ op-tuh-muhm ]
/ ˈɒp tə məm /

noun, plural op·ti·ma [op-tuh-muh] /ˈɒp tə mə/, op·ti·mums.

the best or most favorable point, degree, amount, etc., as of temperature, light, and moisture for the growth or reproduction of an organism.
the greatest degree or best result obtained or obtainable under specific conditions.


most favorable or desirable; best: optimum conditions.

Origin of optimum

1875–80; < Latin: noun use of neuter of optimus best, suppletive superlative of bonus good
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for optimum

/ (ˈɒptɪməm) /

noun plural -ma (-mə) or -mums

a condition, degree, amount or compromise that produces the best possible result


most favourable or advantageous; bestoptimum conditions

Word Origin for optimum

C19: from Latin: the best (thing), from optimus best; see optimism
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012