Any half-sphere, formed by a plane intersecting the center of a sphere. .
A realm or domain of activity .
A map or projection of a celestial or terrestrial hemisphere .
Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .
Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. .
Either of the two halves of the cerebrum. .
A small sphere.