/ Dictionary / Index P partial tone: Meaning and Definition of Find definitions for: par'tial tone" Pronunciation: [key] — Acoustics, Music. Acoustics,Music. one of the pure tones forming a part of a complex tone. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. partial sum partial vacuum Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language