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

Its distinctive, colorful spots are created by a combination of chemistry, geology and climate. — Maureen O'Hare, CNN Money, 25 July 2026

But much as the geology of the Strait of Hormuz gives Iran a narrow choke point to throttle international trade, the geology of the mountain, known in Iran as Kuh-e Kolang Gaz La, provides powerful protection for nuclear equipment. — Stephanie Pappas, Scientific American, 23 July 2026

Outside, the home opens to a resort-style pool and gathering area that leans into the ranch’s geology. — David Caraccio, Sacbee.com, 23 July 2026

And throughout the store, archival gems connect Tiffany to the region’s geology, including a rare specimen of morganite from Mesa Grande in San Diego County (on loan from a private collection), as well as historic kunzite pieces. — John Wogan, Travel + Leisure, 22 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