/ Dictionary / Index Z zero-point energy: Meaning and Definition of Find definitions for: ze'ro-point en"ergy Pronunciation: (zēr'ō-point"), [key] — Physics. Physics. energy in a substance at the temperature of absolute zero. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zero hour zero population growth Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language