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geologic time

noun
  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

[jē′ə-lŏjĭk]
  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.