- Any of the halves into which the celestial sphere is divided by either the celestial equator or the ecliptic.
- Any of the halves of the earth: the earth is divided by the equator into the N and S hemispheres and by a meridian into the E Hemisphere (containing Europe, Asia, Africa, and Australia) and the W Hemisphere (containing the Americas and Oceania)
- A model or map of any of these halves.
An example of hemisphere is the southern part of the world.
An example of hemisphere is the left side of the brain.
Other Word Forms
Origin of hemisphere
- From Latin hemisphaerium, from Ancient Greek ἡμισφαίριον (hēmisphairion), from ἡμι- (hēmi-, “half”) + σφαῖρα (sphaira).