Synonyms for Coupled (same or very similar meaning)
WordNet sense 1 (joined together especially in a pair or pairs):
conjugate, conjugated, conjugateWordNet sense 2 (characterized by unity; being or joined into a single entity):
unitedWordNet sense 3 (connected by a link, as railway cars or trailer trucks):
joined, linkedWordNet sense 4 (joined or linked together):
connectedFrom the ODE community, based on WordNetadd/edit