1The action or fact of coupling one person or thing to another; union, pairing, mating. Of persons. Frequently: marriage union.
A component used to bind or brace together two other components of a structure; the structure so bound. Compare "tie".
Late 15th century; earliest use found in William Caxton (1415x24–1492), printer, merchant, and diplomat. From Middle French accouplement (of persons) coupling, sexual union, action of harnessing two animals together, pairing, union of marriage from accoupler + -ment.