/ Dictionary / Index E extremely: Meaning and Definition of Find definitions for: ex•treme•ly Pronunciation: (ik-strēm'lē), [key] — adv. in an extreme degree; exceedingly: extremely cold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: extremely (Thesaurus) extreme extremely high frequency Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language