American English

Definition of optimum adjective from the Oxford Advanced American Dictionary



    [only before noun]
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  1. 1(also optimal) the best possible; producing the best possible results optimum growth the optimum use of resources the optimum conditions for effective learning
  2. 2the optimum noun [singular] the best possible result, set of conditions, etc. synonym ideal For efficient fuel consumption a speed of 60 mph is about the optimum.
See the Oxford Advanced Learner's Dictionary entry: optimum