/ Dictionary / Index P phase modulation: Meaning and Definition of Find definitions for: phase' modula"tion Pronunciation: [key] — Electronics. Electronics. radio transmission in which the carrier wave is modulated by changing its phase to transmit the amplitude and pitch of the signal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phase microscope phaseout Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language