# halfspace

> English word · Noun

## Definitions
1. Either of the two parts of a three-dimensional object cut by a two-dimensional plane
2. A simple mathematical model of the structure of the Earth, as used in seismology.

## Etymology
From half + space.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/halfspace