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

Mars has been mapped extensively for its geology, minerals and chemistry, yet researchers have lacked a unified system to classify its soils by multiple properties. — Rupendra Brahambhatt, Interesting Engineering, 17 Oct. 2026

Those instruments are to investigate the subsurface structure of Mars, the geomorphology and geology of surface terrains, as well as look at the meteorology of the atmosphere and the radiation environment. — Leonard David, Space.com, 15 Oct. 2026

Throughout a half-century in journalism, insights – and in many cases, direct quotes – from a course on Shakespeare, another on the King James Bible, a third on geology, and another on American diplomatic history found their way into my columns. — David Shribman, Christian Science Monitor, 10 Oct. 2026

Their label Loma Vista matched them with Waxwork Records, who brought their vision to fruition alongside help from the University of Georgia’s geology department. — Jaeden Pinder, Rolling Stone, 9 Oct. 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