non-Euclidean geometry

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:
1870–75; non- + Euclidean

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World English Dictionary
non-Euclidean geometry
 
n
the branch of modern geometry in which certain axioms of Euclidean geometry are restated. It introduces fundamental changes into the concept of space

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