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

Perseverance's adventures have revealed some insights about the enigmatic Martian geology. —Eric Lagatta, USA Today, 4 Apr. 2025

Yet, while Yellowstone National Park's bubbling hydrothermal wonders and dynamic geology captivate the imagination, they are seldom linked to Yosemite National Park's towering sequoias and sheer granite cliffs. —Evie Carrick, Travel + Leisure, 25 Mar. 2025

His work has appeared in publications including Science News, Science, Nature, and Scientific American. paleontology ecology geology 1 free article left Want More? —Paul Smaglik, Discover Magazine, 12 Mar. 2025

Further research combining mathematical modeling with observations of Venus's surface will help provide a better understanding of the planet's geology, the researchers said. —Samantha Mathewson, Space.com, 4 Apr. 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