[ haf-pleyn, hahf- ]
/ ˈhæfˌpleɪn, ˈhɑf- /
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
Words nearby half-plane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020