hemisphere

noun6

1. •
   Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .
2. •
   Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. .
3. •
   Any half-sphere, formed by a plane intersecting the center of a sphere. .
4. •
   Either of the two halves of the cerebrum. .
5. •
   (figurative) A realm or domain of activity .

   • Love is the Columbus of our moral world, and opens, at some period or other, a new hemisphere to our view. — 1831
6. •
   A map or projection of a celestial or terrestrial hemisphere .