Question

What is a hemisphere?

Answer 1

a half of a sphere.

a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.

a half of the celestial sphere.

each of the two parts of the cerebrum (left and right) in the brain of a vertebrate.

noun: cerebral hemisphere; plural noun: cerebral hemispheres

Answer 2

A hemisphere is the half of a sphere. In geographic terms, a hemisphere is a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.