/ Dictionary / Index G geothermal gradient: Meaning and Definition of Find definitions for: ge'other'mal gra'dient Pronunciation: [key] the increase in temperature with increasing depth within the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. geothermal geotropic Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language