Antipode
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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.
- For the geographical concept, see antipodes.
- For the abstract mathematical concept that arose from the geographical usage, see antipodal point.
- For Hopf algebras, see Hopf algebra.