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

Together, the orbiters will investigate Mercury's composition, geology, tenuous exosphere and magnetic field, helping scientists understand how the planet formed and evolved so close to the sun. —Samantha Mathewson, Space.com, 1 Jan. 2026

One of Owen's children later turned the building into a geology laboratory. —Domenica Bongiovanni, IndyStar, 30 Dec. 2025

Attending lectures is a popular pastime onboard, with experts sharing their knowledge of wildlife including polar bears, walrus, and reindeer, as well as geology, history, and workshops on photography. —Kristen E. Pope, Travel + Leisure, 29 Dec. 2025

After nearly three decades of research, China selected the remote Beishan region of Gansu province, known for its ancient and solid geology. —Bojan Stojkovski, Interesting Engineering, 27 Dec. 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