hemisphere hemisphere /ˈhɛmɪsˌfɪr/

noun

1. () Half of the terrestrial globe  ( hemisphere )
   half of the terrestrial globe
     They traveled to the Southern Hemisphere, experiencing summer during the winter months.
   They traveled to the Southern Hemisphere, experiencing summer during the winter months.
   
   
2. Either half of the cerebrum  ( cerebral hemisphere , hemisphere )
   either half of the cerebrum
   
   
3. Half of a sphere  ( hemisphere )
   half of a sphere