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

By microscopically studying Bennu, researchers have also been able to find that the asteroid's geology has changed over the years due to interactions with water and ice. —Kenna Hughes-Castleberry, Space.com, 29 Aug. 2025

Popular majors include biology, psychology and business and managerial economics, though the school is also well-known for its geology and anthropology programs. —Emma Whitford, Forbes.com, 26 Aug. 2025

Their missions are expected to support long-term research contributing to global knowledge of deep-sea environments, biodiversity, and marine geology. —Sujita Sinha, Interesting Engineering, 25 Aug. 2025

While parts of London’s Tube have flooded several times in the past few years, scorching summers create a fresh hell, enhanced by the heat-trapping clay geology. —Laura Paddison, CNN Money, 25 Aug. 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