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

At the other extreme, Zankov turned argyle into a mix of color and geometry that reads maximalism at its best. —Minty Mellon, Vogue, 24 Sep. 2025

Instead, designers found ways to make geometry feel alive, a balancing act between strength and movement. —Essence, 24 Sep. 2025

First, although the current in the ion gauge is proportional to the pressure in the chamber, that proportionality constant depends on a lot of fine details, such as the precise geometry of the filament and the grid. —IEEE Spectrum, 24 Sep. 2025

The shapes were usually geometric, and the women were geometries to be looked at, drawn, and pursued. —Zachary Fine, New Yorker, 23 Sep. 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