(n.) The opposite pole; anything diametrically opposed.

North Pole South Pole antipodal points antipode antipodes antipoints antipoles antithesis antonym black and white contra contradictory contraposita contrapositives contraries contrary converse counter counterbalance countercheck counterpoint counterpoise counterpole counterpoles counterterm foil inverse night and day obverse offset opposite opposite number opposite poles opposites polar opposites poles reverse setoff the contrary the other side vis-a-vis