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

Her materials include those most basic elements of the earth—geology—and her forms borrow from totems, obelisks, prehistoric megaliths, and Indigenous Caribbean zeniths. —Emily Watlington, ARTnews.com, 7 Apr. 2026

Their snappy language reflected a familiarity with lunar geology. —Stephen Clark, ArsTechnica, 7 Apr. 2026

The Artemis 2 quartet chronicled their historic journey in detail, capturing some photos that could help scientists better understand lunar geology and evolution, and others that seemed designed just to blow our minds. —Mike Wall, Space.com, 7 Apr. 2026

Nothing on this scale exists anywhere else on the planet, onshore or offshore, testifying to the unique petroleum geology of the Persian Gulf region. —Scott L. Montgomery, The Conversation, 7 Apr. 2026

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