hemisphere

1. (astronomy, astrology) Half of the celestial sphere, as divided by either the ecliptic or the celestial equator .Synonyms: celestial hemisphere

2. (figuratively) A realm or domain of activity .Examples: "Love is the Columbus of our moral world, and opens, at some period or other, a new hemisphere to our view."Synonyms: spherefiguratively

3. (geography) Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. .

4. (geometry) Any half-sphere, formed by a plane intersecting the center of a sphere. .Synonyms: half-sphere

5. (cartography) A map or projection of a celestial or terrestrial hemisphere .Synonyms: planisphere

6. (anatomy) Either of the two halves of the cerebrum. .Synonyms: cerebral hemisphere