• (RP) IPA: /ˈhɛmɪsfɪə/
  • (America) enPR: hĕ'mĭsfîr, IPA: /ˈhɛmɪsfɪəɹ/

hemisphere (plural hemispheres)

  1. (astronomy, astrology) 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 [1503].
  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 [1706].
  6. (anatomy) Either of the two halves of the cerebrum. [1804].
  • (astronomy: half of the celestial sphere) celestial hemisphere
  • (geography: half of the terrestrial sphere) terrestrial hemisphere
  • (figuratively: a domain of thought or action) sphere
  • (geometry: half of a sphere) half-sphere, half sphere
  • (anatomy: either of the two lobes of the cerebellum) cerebral hemisphere
  • (cartography: a map showing a projection of a hemisphere) planisphere
  • Russian: полусфе́ра
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