/ Dictionary / Index E Euler's phi-function: Meaning and Definition of Find definitions for: Eu'ler's phi'-func•tion Pronunciation: [key] — Math. Math. the function that assigns to each integer the number of positive integers less than the given integer and relatively prime to the given integer. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Euler's formula Euless Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language