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geologic

or ge·o·log·i·cal

[jee-uh-loj-ik or jee-uh-loj-i-kuh l]
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adjective
  1. of, relating to, or based on geology.
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Origin of geologic

First recorded in 1790–1800; geolog(y) + -ic
Related formsge·o·log·i·cal·ly, adverbnon·ge·o·log·ic, adjectivenon·ge·o·log·i·cal, adjectivenon·ge·o·log·i·cal·ly, adverbpre·ge·o·log·i·cal, adjectiveun·ge·o·log·i·cal, adjectiveun·ge·o·log·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for geological

adj.

1795, from geology + -ical. Related: Geologically.

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geologic

adj.

1799, from geology + -ic. Geologic time is recorded from 1861.

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Online Etymology Dictionary, © 2010 Douglas Harper