hemisphere.
Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .
Meaning & usage
Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .
A realm or domain of activity .
Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. .
Any half-sphere, formed by a plane intersecting the center of a sphere. .
A map or projection of a celestial or terrestrial hemisphere .
Either of the two halves of the cerebrum. .
Where this word comes from
From Latin hemisphaerium, from Ancient Greek ἡμισφαίριον (hēmisphaírion), from ἡμι- (hēmi-, “half”) + σφαῖρα (sphaîra, “sphere”). Equivalent to hemi- + sphere. Displaced native Old English healftrendel (literally “half-sphere”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.