half-plane

[ haf-pleyn, hahf- ]
/ ˈhæfˌpleɪn, ˈhɑf- /

noun Mathematics.

the part of the plane on one side of a straight line of infinite length in the plane.

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Origin of half-plane

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020