# Definition: Geometry

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## Etymology

From Old French géométrie, from Latin geōmetria, from Ancient Greek γεωμετρία or geōmetría (geometry, land-survey), from γεωμέτρης or geōmétrēs (land measurer), from γῆ or (earth, land, country) + -μετρία or -metría (measurement), from μέτρον or métron (a measure).

## Noun

geometry (countable and uncountable, plural geometries)

1. (mathematics) The branch of mathematics dealing with spatial relationships.
I learned about squares and other polygons in geometry class.
2. (mathematics, often qualified in combination) A mathematical system that deals with spatial relationships and that is built on a particular set of axioms; a subbranch of geometry which deals with such a system or systems.
After reading various popular mathematics books, I became interested in four-dimensional geometry and other theoretical subjects.
3. (countable) The observed or specified spatial attributes of an object, etc.
4. (algebraic geometry) A mathematical object comprising representations of a space and of its spatial relationships.

### Derived terms

• algebraic geometry
• anabelian geometry
• analytical geometry
• arithmetic geometry
• combinatorial geometry
• complex geometry
• computational geometry
• conformal geometry
• contact geometry
• descriptive geometry
• differential geometry
• elementary geometry
• elliptic geometry
• Euclidean geometry
• finite geometry
• fractal geometry
• hyperbolic geometry
• hypergeometry
• imaginary geometry
• Kerr geometry
• Klein geometry
• plane geometry
• spherical geometry
• variable geometry

• geometer
• geometric
• geometrical