• synonyms

geologic time

  1. the succession of eras, periods, and epochs as considered in historical geology.
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Origin of geologic time

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

geologic time in Science

geologic time

  1. The period of time covering the formation and development of the Earth, from about 4.6 billion years ago to today.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.