Webster's English Dictionary

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optimum

op.ti.mum \'a:p-t*-m*m\ \-m*\ n or op.ti.ma also optimums [L] pl  1: the 
   amount or degree of something that is most favorable to some end; Xesp : 
   the most favorable condition for the growth and reproduction of an organism 
   2: greatest degree attained under implied or specified conditions  - 
   optimum aj