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

The suspension has been reworked by completely altering its geometry, mounting points, and damping. —Basem Wasef, Robb Report, 17 June 2026

Use a geometry compass or a round object, like a dinner plate, to draw a smooth arch connecting these two lines. —Ella Field, Better Homes & Gardens, 16 June 2026

Cutting fabrication time and cost The new method is capable of producing complex geometries and structures larger than the printing equipment itself. —Chris Young, Interesting Engineering, 16 June 2026

For example, using geometry and the longitudinal position of the home, the team angled the awning over the windows in the main living space so shade falls in front of the house in summer and moves deep into the living area in winter to heat the polished concrete floor. —Noah Daly, Idaho Statesman, 13 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