hemisphere
/ˈhɛmɪsfɪə/noun
One half of the Earth, such as the northern, southern, eastern, or western half.
Example sentence
- “When it's summer in the Northern Hemisphere, it's winter in the Southern Hemisphere.”
Also each half of the brain, left and right, in everyday science writing. 'Northern Hemisphere' and 'Southern Hemisphere' are capitalized as proper place names.