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

With ideal geology for storing CO₂ underground safely and effectively, the Government of Manitoba passed legislation in 2024 to allow for CO₂ storage. —Prabhat Ranjan Mishra, Interesting Engineering, 10 Oct. 2025

Copper is bound by geology and time. —IEEE Spectrum, 9 Oct. 2025

Or nurture an adolescent interest in geology with a rock study kit. —Megan Ulu-Lani Boyanton, Better Homes & Gardens, 8 Oct. 2025

Over the past several years, the spacecraft has conducted close flybys of the moons Ganymede, Europa and Io, delivering data on their geology, environments and composition. —Josh Dinner, Space.com, 6 Oct. 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