non-euclidean

adjective, often capitalized E
non-eu·​clid·​e·​an | \ˌnän-yü-ˈkli-dē-ən \

Definition of non-euclidean 

: not assuming or in accordance with all the postulates of Euclid's Elements non-euclidean geometry

First Known Use of non-euclidean

1872, in the meaning defined above

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The first known use of non-euclidean was in 1872

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