non-Euclidean geometry

noun

geometry based upon one or more postulates that differ from those of Euclid, especially from the postulate that only one line may be drawn through a given point parallel to a given line.

Origin of non-Euclidean geometry

First recorded in 1870–75; non- + Euclidean

British Dictionary definitions for non-euclidean geometry

non-Euclidean geometry

noun

the branch of modern geometry in which certain axioms of Euclidean geometry are restated. It introduces fundamental changes into the concept of space