What does hemisphere mean?

Looking for the meaning or definition of the word hemisphere? Here's what it means.

Noun
  1. (astronomy) Half of the celestial sphere, as divided by either the ecliptic or the celestial equator [from 14th c.].
  2. (figuratively) A realm or domain of activity.
  3. (geography) Half of the Earth, such as the Northern Hemisphere, Southern Hemisphere, Western Hemisphere or Eastern Hemisphere, Land Hemisphere, Water Hemisphere etc. [1550s].
  4. (geometry) Any half-sphere, formed by a plane intersecting the center of a sphere. [1580s].
  5. (cartography) A map or projection of a celestial or terrestrial hemisphere.
  6. (anatomy) Either of the two halves of the cerebrum..
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