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extremal

[ik-stree-muh l]
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adjective Mathematics.
  1. of or relating to an extremum or the calculation of extrema: an extremal problem.

Origin of extremal

1400–50; late Middle English. See extrem(um), -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for extremal

extremal

noun
  1. maths logic the clause in a recursive definition that specifies that no items other than those generated by the stated rules fall within the definition, as in 1 is an integer, if n is an integer so is n+1, and nothing else is
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012