noun, plural ge·om·e·tries.

  1. 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.
  2. any specific system of this that operates in accordance with a specific set of assumptions: Euclidean geometry.
  3. the study of this branch of mathematics.
  4. a book on this study, especially a textbook.
  5. the shape or form of a surface or solid.
  6. a design or arrangement of objects in simple rectilinear or curvilinear form.


  1. the branch of mathematics concerned with the properties, relationships, and measurement of points, lines, curves, and surfacesSee also analytical geometry, non-Euclidean geometry
    1. any branch of geometry using a particular notation or set of assumptionsanalytical geometry
    2. any branch of geometry referring to a particular set of objectssolid geometry
  2. a shape, configuration, or arrangement
  3. arts the shape of a solid or a surface

early 14c., from Old French géométrie (12c.), from Latin geometria, from Greek geometria “measurement of earth or land; geometry,” from comb. form of ge “earth, land” (see Gaia) + -metria (see -metry).

  1. The mathematical study of the properties, measurement, and relationships of points, lines, planes, surfaces, angles, and solids.

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

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