συζυγία

Etymology
From.

Noun

 * 1) union, junction
 * 2) yoke of animals
 * 3)  pair
 * 4) squadron of four war-chariots
 * 5) coupling, copulation
 * 6) conjunction of words or things in pairs
 * 7)  conjugation or declension
 * 8)  syzygy, alignment of celestial bodies