also: たいせき
noun-modifying (irregular)
antipodal; diametrically opposite
Mathematical term describing points on a sphere that are directly opposite each other. Also used figuratively for diametrical opposition.
地球上の対蹠点は、互いに正反対の位置にある。
Antipodal points on the Earth are located exactly opposite each other.
彼らの意見は対蹠的で、妥協の余地がなかった。
Their opinions were diametrically opposed, leaving no room for compromise.
Common word for 'exact opposite' in everyday contexts, while 対蹠 is a technical mathematical term.
From Chinese 對蹠 (duìzhí), composed of 對 'opposite' and 蹠 'sole of the foot', originally referring to people standing with their feet opposite each other on the globe.