/ Dictionary / Index S stationary state: Meaning and Definition of Find definitions for: sta'tionary state' Pronunciation: [key] — Physics. Physics. any of several energy states an atom may occupy without emitting electromagnetic radiation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stationary front stationary wave Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language