/ Dictionary / Index P preemphasis: Meaning and Definition of Find definitions for: pre•em•pha•sis Pronunciation: (prē-em'fu-sis), [key] — n. Electronics. a process of increasing the amplitude of certain frequencies relative to others in a signal in order to help them override noise, complemented by deemphasis before final reproduction of the signal being received. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preeminent preemployment 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