non-eu·clid·e·an
| \ ˌnän-yü-ˈkli-dē-ən
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Definition of non-euclidean
: not assuming or in accordance with all the postulates of Euclid's Elements
non-euclidean geometry
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“Non-euclidean.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/non-euclidean. Accessed 28 Jan. 2022.
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The first known use of non-euclidean was in 1872
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