/ Dictionary / Index E extremum: Meaning and Definition of Find definitions for: ex•tre•mum Pronunciation: (ik-strē'mum), [key] — pl. -ma a maximum or minimum value of a function in a specified neighborhood. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extremum (Thesaurus) extremity extricable Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language