/ Dictionary / Index I isotonic exercise: Meaning and Definition of Find definitions for: i'soton'ic ex'ercise Pronunciation: [key] exercise or a program of exercises to increase muscular strength, power, and endurance based on lifting a constant amount of weight at variable speeds through a range of motion. any specific exercise of this type. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isotonic isotonic sodium chloride solution Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language