/ Dictionary / Index C critical state: Meaning and Definition of Find definitions for: crit'ical state' Pronunciation: [key] — Physics. Physics. the state of a pure element or compound when it is at a critical point. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. critical region critical temperature 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