/ Dictionary / Index T thermodynamic system: Meaning and Definition of Find definitions for: ther'modynam'ic sys'tem Pronunciation: [key] — Physics. Physics. a system whose states of equilibrium can be specified by a few macroscopic properties. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thermodynamics thermoelastic Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language