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coupling (n.)

mid-14c., "the joining of one thing to another," verbal noun from couple (v.). From late 14c. as "the joining of two persons in love or marriage," also "copulation." Meaning "that which couples or connects" is from 1540s.

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Definitions of coupling from WordNet

coupling (n.)
a connection (like a clamp or vise) between two things so they move together;
Synonyms: yoke
coupling (n.)
a mechanical device that serves to connect the ends of adjacent objects;
Synonyms: coupler
coupling (n.)
the act of pairing a male and female for reproductive purposes;
the casual couplings of adolescents
Synonyms: mating / pairing / conjugation / union / sexual union
From wordnet.princeton.edu