/ Dictionary / Index F fundamental particle: Meaning and Definition of Find definitions for: fun'damen'tal par'ticle. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fundamental law fundamental sequence Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language