optimum

American  

[op-tuh-muhm] / ˈɒp tə məm /

noun

plural

optima, optimums

1. the best or most favorable point, degree, amount, etc., as of temperature, light, and moisture for the growth or reproduction of an organism.

2. the greatest degree or best result obtained or obtainable under specific conditions.

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adjective

1. most favorable or desirable; best.

   optimum conditions.

   Synonyms:

   optimal, perfect, ideal

optimum British  

/ ˈɒptɪməm /

noun

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

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adjective

1. most favourable or advantageous; best

   optimum conditions

Etymology

Origin of optimum

First recorded in 1875–80; from Latin: noun use of neuter of optimus “best,” superlative of bonus “good”

Compare meaning

How does optimum compare to similar and commonly confused words? Explore the most common comparisons:

• optimum vs. optimal

Example Sentences

Dark and clear nights are the optimum viewing conditions so let's hope that 2026 gifts us with more spectacles in the night sky.

From BBC

“There is a reason why those guys that have been missed are starters,” McVay said, speaking generally, “because they give us the best chance to play at the optimum levels.”

From Los Angeles Times

From pot two, Australia might be the optimum draw, with New Zealand from pot four.

From BBC

Fine, but it's undeniable his team have been nowhere near their optimum level under his recent stewardship.

From BBC

"Whatever the species, it simply must have a smaller temperature range at which life is viable once temperatures shift above the optimum."

From Science Daily