/ Dictionary / Index F fundamental frequency: Meaning and Definition of Find definitions for: fun'damen'tal fre'quency Pronunciation: [key] — Physics. Physics. the lowest frequency at which a medium will freely oscillate. the frequency of the fundamental. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fundamental bass fundamentalism Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language