half-space

noun

ˈhaf-ˌspās 

ˈhäf-

: the part of three-dimensional euclidean space lying on one side of a plane

Examples of half-space in a Sentence

Recent Examples on the Web

At no point, for example, did either Milan or Inter invert a full back — no, not even a single one — in order to create an overload in one of the central half-spaces. —Rory Smith, New York Times, 10 May 2023

Word History

First Known Use

1894, in the meaning defined above