/ Dictionary / Index G geologic time: Meaning and Definition of Find definitions for: ge'olog'ic time' Pronunciation: [key] the succession of eras, periods, and epochs as considered in historical geology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Geological Survey geologist Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language