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

The other surprise about Boquete is its climate and the natural greenhouse conditions the local geology creates. — Peter Lane Taylor, Forbes.com, 10 July 2026

There are hundreds of sewer overflow points throughout the Allegheny, the Monongahela and the Ohio rivers, Daniel Bain, associate professor of geology and environmental science at University of Pittsburgh. — Finch Walker, USA Today, 5 July 2026

They're trained in geology, formations, history, wildlife, guest safety, emergency protocols, conservation, and storytelling. — Mary Catherine McAnnally Scott, Southern Living, 4 July 2026

What the new study does provide is a numerical estimate of the stress in the fault system, said Michael Oskin, a professor of geology at UC Davis who was not involved with the study. — Velvet Wu july 3, Sacbee.com, 3 July 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

• ology
• aetiology
• anthropology
• archaeology
• archeology
• audiology
• cardiology
• climatology
• cohomology
• cosmetology
• criminology
• demonology

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