Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Latin
Origin: 'best'

optimum

 adjective
     
op‧ti‧mum [only before noun]
the best or most suitable for a particular purpose or in a particular situation:
optimum conditions for growth
This design makes the optimum use of the available space.
—optimum noun [singular]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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