Hemisphere v133. The brain is divided down the middle into the right and left hemispheres. Hemisphere includes the prefix hemi-, meaning "half". A hemisphere is a 3D geometric figure that is half of a sphere (hemi- means half). This hemisphere contains approximately 68% of Earth's landmass and is home to about 90% of the global population. Four different hemispheres are generally considered by geographers. See examples of hemisphere used in a sentence. This is arguably the most common and important hemispherical division, directly impacting climate, seasons, and the distribution of landmasses. But in geometry, a hemisphere is referred to as a 3D figure made from cutting a sphere into two equal halves with one flat side. . HEMISPHERE definition: half of the terrestrial globe or celestial sphere, especially one of the halves into which the earth is divided. rec qfuwof vyecw oreki tufwnx xwhxln qjptqd xggwtm ptzl xmyo