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

• 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

Boissevain’s nature photography captures these in-transition landscapes in vivid hues and alien geometries, from close-ups of jellyfish-like crystal deposits to aerial shots of what scans like the surface of Mars. —Randy McMullen, Mercury News, 16 Oct. 2025

Its geometry can be tailored for specific scenarios, and in one demonstration, the humanoid gymnast robot used its flexible limbs to swing along a ceiling for locomotion. —Neetika Walter, Interesting Engineering, 16 Oct. 2025

The new Studio introduces an intuitive Smart Machining Wizard that automatically analyzes project geometry and recommends optimal toolpath parameters. —New Atlas, 16 Oct. 2025

The next pair, Steel Nomad's regular and Light subtests, focuses on APIs more commonly used for game development, like Metal and DirectX 12, to assess gaming geometry and particle effects. —PC Magazine, 16 Oct. 2025

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

• cytometry
• isometry
• manometry
• morphometry
• optometry
• photometry
• spectrometry
• spirometry
• thermometry
• anthropometry
• audiometry
• densitometry

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