/ Dictionary / Index P partial vacuum: Meaning and Definition of Find definitions for: par'tial vac'uum Pronunciation: [key] an enclosed space from which part of the air or another gas has been removed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. partial tone partible 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