(geometry) A US spelling of non-Euclidean geometry.

(mathematics) a branch of mathematics that investigates those properties of figures that are invariant when projected from a point to a line or plane

(mathematics) A recent branch of geometry that can be described as a piecewise linear version of real algebraic geometry.

(geometry) The subbranch of geometry that investigates geometrical figures via the mathematical properties of their representations in a coordinate system.

The geometry of empty spacetime around a rotating uncharged axially-symmetric black hole with a spherical event horizon.

Alternative form of analytic geometry

(geometry) Absolute geometry, an axiomatised geometry in which the parallel postulate is absent and not replaced by an alternative, and of which Euclidean geometry and some non-Euclidean geometries are subtypes.

(of an aircraft) Having the ability to adjust the shape / configuration of its wings whilst in flight

(geometry) The branch of geometry concerned with inversion transformations, specifically circle inversions in the Euclidean plane, but also as generalised in non-Euclidean and higher-dimensional spaces.

The study of figures having parts that lie in a singular plane.