Hemisphere

[hem-i-sfeer] /ˈhɛm ɪˌsfɪər/

noun
1.
(often initial capital letter) half of the terrestrial globe or celestial sphere, especially one of the halves into which the earth is divided.
Compare , , , .
2.
a map or projection representing one of these halves.
3.
a half of a sphere.
4.
Anatomy. either of the lateral halves of the cerebrum or cerebellum.
5.
the area within which something occurs or dominates; sphere; realm.
/ˈhɛmɪˌsfɪə/
noun
1.
one half of a sphere
2.

3.
either of the two halves of the celestial sphere that lie north or south of the celestial equator
4.
(anatomy) short for cerebral hemisphere
n.

late 14c., hemysperie, in reference to the celestial sphere, from Latin hemisphaerium, from Greek hemisphairion, from hemi- “half” (see hemi-) + sphaira “sphere” (see sphere). Spelling reformed 16c. Of the Earth, from 1550s; of the brain, 1804.

hemisphere hem·i·sphere (hěm’ĭ-sfēr’)
n.

hem’i·spher’ic (-sfēr’ĭk, -sfěr’-) or hem’i·spher’i·cal adj.
hemisphere
(hěm’ĭ-sfîr’)

Any half of the Earth’s surface.