/ Dictionary / Index E Euler's diagram: Meaning and Definition of Find definitions for: Eu'ler's di'agram Pronunciation: [key] — Logic. Logic. one of a number of graphic representations of the logical relations among classes by means of relations among circles or other geometric figures. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Euler-Chelpin Euler's formula Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language