Meaning of “optimum” in the English Dictionary

"optimum" in American English

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optimumadjective [ not gradable ]

us /ˈɑp·tə·məm/ also optimal

being the best or most likely to bring success or advantage:

For optimum flavor, prepare just before serving.

(Definition of “optimum” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"optimum" in Business English

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optimumadjective [ before noun ]

uk /ˈɒptɪməm/ us

the best or most effective possible in a particular situation:

A mixture of selected funds is an optimum choice for future security and return on investment.
The figures show investment below the optimum level in the UK.
The software keeps your hard disk organized for optimum performance.
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(Definition of “optimum” from the Cambridge Business English Dictionary © Cambridge University Press)