Etymology
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non-Euclidean 

"not in accordance with the principles of Euclid," 1874, from non- + Euclidean.

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non-cooperation (n.)

also noncooperation, "failure or refusal to cooperate," 1795, from non- + cooperation.

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non-toxic (adj.)

also nontoxic, "not poisonous," 1892, from non- + toxic.

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non-perishable (adj.)

also nonperishable, "not subject to rapid decay or deterioration," 1887, from non- + perishable.

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non-vascular (adj.)

also nonvascular, "lacking vessels for the circulation of fluid," 1815, from non- + vascular.

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non-violence (n.)
also nonviolence, 1831, from non- + violence. Gandhi used it from 1920.
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non-importation (n.)

also nonimportation, "a refraining from importing," 1770, from non- + importation.

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non-sectarian (adj.)

also nonsectarian, "not involving or relating to a specific religious sect," 1825, from non- + sectarian.

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non-polar (adj.)

also nonpolar, 1840, in chemistry and physics, from non- + polar.

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non-commissioned (adj.)

of officers in the army, "not having a commission," 1703; see non- + commission (v.).

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