noun, plural geometries.
the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties of space.
any specific system of this that operates in accordance with a specific set of assumptions: Euclidean geometry.
the study of this branch of mathematics.
a book on this study, especially a textbook.
the shape or form of a surface or solid.
a design or arrangement of objects in simple rectilinear or curvilinear form.

1300–50; Middle English < Latin geōmetria < Greek geōmetría. See geo-, -metry Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
geometry (dʒɪˈɒmɪtrɪ)
1.  analytical geometry See also non-Euclidean geometry the branch of mathematics concerned with the properties, relationships, and measurement of points, lines, curves, and surfaces
2.  a.  any branch of geometry using a particular notation or set of assumptions: analytical geometry
 b.  any branch of geometry referring to a particular set of objects: solid geometry
3.  a shape, configuration, or arrangement
4.  arts the shape of a solid or a surface
[C14: from Latin geōmetria, from Greek, from geōmetrein to measure the land]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

early 14c., from O.Fr. géométrie, from L. geometria, from Gk. geometria "measurement of earth or land, geometry," from ge "earth, land" + -metria, from metrein "to measure."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
geometry   (jē-ŏm'ĭ-trē)  Pronunciation Key 
The mathematical study of the properties, measurement, and relationships of points, lines, planes, surfaces, angles, and solids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

geometry definition

The branch of mathematics that treats the properties, measurement, and relations of points, lines, angles, surfaces, and solids. (See Euclid and plane geometry.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


the branch of mathematics concerned with the shape of individual objects, spatial relationships among various objects, and the properties of surrounding space. It is one of the oldest branches of mathematics, having arisen in response to such practical problems as those found in surveying, and its name is derived from Greek words meaning "Earth measurement." Eventually it was realized that geometry need not be limited to the study of flat surfaces (plane geometry) and rigid three-dimensional objects (solid geometry) but that even the most abstract thoughts and images might be represented and developed in geometric terms

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
One of my favorite high-school subjects was geometry.
The first biometric technology to become widely used was hand geometry.
Balance and geometry play a crucial role in successful composition.
Many cosmologists think the universe's shape may be best described using
  hyperbolic geometry.
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