antipode

n. complete opposite, opposing side, opposite pole

The word antipode can be used to mean either the point on the surface of the earth or another celestial body that is diametrically opposite to a given point (usually used as a plural in this sense), or the exact opposite or contrary of something. It is a back-formed singular from the word antipodes, which originally was not plural.
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Noun
1. direct opposite; "quiet: an antipode to focused busyness"
(hypernym) opposition, oppositeness

n. antipode, complete opposite, opposing side, opposite pole

adj. antipodal, diametrically opposite

n. antipode, complete opposite

n. antipodes, points diametrically opposed to one another (particularly on the globe)