/ Dictionary / Index I isothermal process: Meaning and Definition of Find definitions for: i'sother'mal proc'ess Pronunciation: [key] — Thermodynam. Thermodynam. a process that takes place without change in temperature. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isothermal isothermobath Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language