geometry

noun

ge·​om·​e·​try jē-ˈä-mə-trē 

plural geometries

1

a

: a branch of mathematics that deals with the measurement, properties, and relationships of points, lines, angles, surfaces, and solids

broadly : the study of properties of given elements that remain invariant under specified transformations

b

: a particular type or system of geometry

Euclidean geometry

2

a

: configuration

… the [bicycle] frame's geometry can be adjusted via a two-position lower shock mount which slackens the angles by another half a degree.

—Liam Mercer

b

: surface shape

the geometry of the landscape

The shape of the earbud is tailored to the geometry of your ear.

—Noah Robischon

The Ken Onion also allows you to choose the type of blade geometry for whatever implement you're sharpening …

—Ariel Kanter

Every object naturally resonates when hit by electromagnetic waves of particular frequencies, which are determined by the object's geometry and material properties.

—Ada Poon

3

: an arrangement of objects or parts that suggests geometric figures

the geometry of neoclassical architecture

Synonyms of geometry

• shape
• form

Examples of geometry in a Sentence

the geometry of Sydney's famed opera house is suggestive of some modernistic sailing ship

Recent Examples on the Web

His distinct style lies at the intersection of urban geometry and natural elements invoking serenity amidst the chaos of everyday life. — Cecilia Rodriguez, Forbes.com, 2 July 2026

Students involved in the program learn geometry concepts through real-world building applications, while also contributing to housing solutions in their community. — Justin Adams, CBS News, 1 July 2026

And what is replacing it is something far more ambiguous—a geometry of genuine progress and radical instability that Luce’s framework cannot contain. — Nick Lichtenberg, Fortune, 30 June 2026

The player uses a stubby wooden bat shaped like a small frying pan to try to scoop it back, but the geometry defeats her. — Mark Rice-Oxley, Christian Science Monitor, 29 June 2026

Word History

Etymology

Middle English geometrie, from Anglo-French, from Latin geometria, from Greek geōmetria, from geōmetrein to measure the earth, from geō- ge- + metron measure — more at measure

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing geometry

• algebraic geometry
• analytic geometry
• coordinate geometry
• differential geometry
• Euclidean geometry
• plane geometry
• projective geometry
• Riemannian geometry
• solid geometry
• spherical geometry
• synthetic geometry

Rhymes for geometry

• anthropometry
• audiometry
• densitometry
• radiometry
• sociometry
• trigonometry
• cytometry
• manometry
• morphometry
• optometry
• photometry
• spectrometry

Kids Definition

geometry

noun

ge·​om·​e·​try jē-ˈäm-ə-trē 

plural geometries

1

: a branch of mathematics that deals with points, lines, angles, surfaces, and solids

2

: shape entry 2

the geometry of a crystal