ge·​ol·​o·​gy | \jē-ˈä-lə-jē \
plural geologies

Definition of geology 

1a : a science that deals with the history of the earth and its life especially as recorded in rocks

b : a study of the solid matter of a celestial body (such as the moon)

2 : geologic features the geology of Arizona

3 : a treatise on geology

Keep scrolling for more

Other Words from geology

geologist \ jē-​ˈä-​lə-​jist \ noun

Examples of geology in a Sentence

learning about the geology of Hawaii

Recent Examples on the Web

Senate Bill 654 creates an Environmental Science Advisory Board, made up of nine individuals appointed by the governor with expertise in engineering, chemistry, geology, or other sciences or disciplines. Keith Matheny, Detroit Free Press, "Gov. Rick Snyder signs controversial 'polluter panels' bill," 29 June 2018 Admission to Springs Preserve includes access to the neighboring Nevada State Museum, which delves into the state’s geology, plants, and native creatures. Kim Windyka, Daily Intelligencer, "The 9 Best Offbeat Museums to Visit in Las Vegas," 16 June 2018 The area has a naturally fractured geology that's more varied than shale, said Jud Walker, president at EnerVest Operating Co. Alex Nussbaum, Houston Chronicle, "Aging oil play getting new life," 15 June 2018 Khazzan’s geology isn’t easy to drill, and Oman initially lacked infrastructure, expertise and drilling data. Sarah Kent, WSJ, "Oil Industry Tries to Take the Fracking Boom Global," 19 June 2018 The geology of the sea floor in the western Pacific is also conducive to the production of whale food. Ryan P. Smith, Smithsonian, "What the Longest Known Whale Shark Migration Ever Tells Us About Conservation," 8 May 2018 But the company says Florida's unique underground geology, and the state's business-friendly environmental regulations, ended up being the perfect mix for its plunge into the U.S. market. Alan Gomez, USA TODAY, "Salmon from sunny South Florida? Norwegian firm builds Florida farm for cold-water fish," 11 Apr. 2018 The association bought the North Side cave in 1995 in order to protect and preserve its biology, geology and history. Kelsey Bradshaw, San Antonio Express-News, "Lee student freed from Robber Baron Cave after 11-hour rescue," 9 Mar. 2018 University of Hawaii geology professor Michael Garcia shows a piece of olivine embedded in a chunk of lava from a prehistoric eruption of Kilauea volcano in his office in Honolulu on Tuesday, June 19, 2018. Washington Post, "NOT REAL NEWS: Erupting Hawaii volcano not raining gemstones," 19 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'geology.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of geology

1735, in the meaning defined at sense 1a

History and Etymology for geology

New Latin geologia, from ge- + -logia -logy

Keep scrolling for more

Learn More about geology

Statistics for geology

Last Updated

4 Nov 2018

Look-up Popularity

Time Traveler for geology

The first known use of geology was in 1735

See more words from the same year

Keep scrolling for more

More Definitions for geology



English Language Learners Definition of geology

: a science that studies rocks, layers of soil, etc., in order to learn about the history of the Earth and its life

: the rocks, land, processes of land formation, etc., of a particular area


ge·​ol·​o·​gy | \jē-ˈä-lə-jē \

Kids Definition of geology

1 : a science that deals with the history of the earth and its life especially as recorded in rocks

2 : the geologic features (as mountains or plains) of an area

Keep scrolling for more

More from Merriam-Webster on geology

See words that rhyme with geology

Spanish Central: Translation of geology

Nglish: Translation of geology for Spanish Speakers

Comments on geology

What made you want to look up geology? Please tell us where you read or heard it (including the quote, if possible).


obstinately defiant of authority

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
True or False

Test your knowledge - and maybe learn something along the way.


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!