Nouns

(n)yoke, couplinga connection (like a clamp or vise) between two things so they move together
(n)coupling, couplera mechanical device that serves to connect the ends of adjacent objects
(n)coupling, mating, pairing, conjugation, union, sexual unionthe act of pairing a male and female for reproductive purposes“the casual couplings of adolescents”, “the mating of some species occurs only in the spring”