/ Dictionary / Index C critical volume: Meaning and Definition of Find definitions for: crit'ical vol'ume Pronunciation: [key] — Physics. Physics. the volume occupied by a certain mass, usually one gram molecule of a liquid or gaseous substance at its critical point. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. critical value criticaster Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language