geology

noun

ge·​ol·​o·​gy jē-ˈä-lə-jē 

plural geologies

1

a

: 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

geologist

jē-ˈä-lə-jist 

noun

Examples of geology in a Sentence

learning about the geology of Hawaii

Recent Examples on the Web

Even the geology of the islands seemed to make a difference! —Melissa Cristina Márquez, Forbes.com, 30 May 2025

Her love of science came from watching PBS shows as a kid with her mom and spending too much time binging Doctor Who. earth science geology ocean 1 free article left Want More? —Monica Cull, Discover Magazine, 16 May 2025

And, the thinking went, with all that heat dissipated, the planet’s geology basically shut down. —Elise Cutts, Scientific American, 13 May 2025

This most recent suite was inspired by a photo of a meteorite in an antique geology textbook, whose caption described its near-collision with an unnamed sharecropper in nineteen-twenties Mississippi. —Julian Lucas, New Yorker, 5 May 2025

Word History

Etymology

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

First Known Use

1735, in the meaning defined at sense 1a

Rhymes for geology

• anthology
• apology
• astrology
• biology
• christology
• chronology
• conchology
• cosmology
• cryptology
• cytology
• doxology
• ecology

Kids Definition

geology

noun

ge·​ol·​o·​gy jē-ˈäl-ə-jē 

plural geologies

1

a

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

b

: a study of the features of a heavenly body (as the moon)

2

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

geologic

ˌjē-ə-ˈläj-ik

adjective

or geological

-i-kəl

geologically

-i-k(ə-)lē

adverb

geologist

jē-ˈäl-ə-jəst 

noun