Definition of hemisphere noun from the Oxford Advanced Learner's Dictionary

     

    hemisphere

     noun
    noun
    BrE BrE//ˈhemɪsfɪə(r)//
     
    ; NAmE NAmE//ˈhemɪsfɪr//
     
    Other geographic regions, The Earth and the atmosphere
     
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  1. 1one half of the earth, especially the half above or below the equator the northern/southern hemisphere In the northern hemisphere, December is a winter month. Wordfinderclimate, earth, equator, equinox, hemisphere, International Date Line, latitude, map, planet, tropic See related entries: Other geographic regions, The Earth and the atmosphere
  2. 2 either half of the brain the left/right cerebral hemisphere the left hemisphere of the brain
  3. 3 one half of a sphere (= a round solid object)
  4. Word Origin late Middle English (in the sense ‘half the celestial sphere, the sky’): from Old French emisphere, via Latin from Greek hēmisphairion, from hēmi- ‘half’ + sphaira ‘sphere’.
See the Oxford Advanced American Dictionary entry: hemisphere