Definition of optimum adjective from the Oxford Advanced Learner's Dictionary

     

    optimum

     adjective
    adjective
    BrE BrE//ˈɒptɪməm//
     
    ; NAmE NAmE//ˈɑːptɪməm//
     
    [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 We aim for optimum efficiency in all our operations. What are the optimum conditions for economic growth?
  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.
  3. Word Origin late 19th cent.: from Latin, neuter (used as a noun) of optimus ‘best’.
See the Oxford Advanced American Dictionary entry: optimum