chainchain1 /tʃeɪn/ ●●● noun 1 [countable, uncountable] a series of metal rings connected together: She wore a delicate gold chain around her neck. a bicycle chain (=that makes the wheels turn)2[countable] a group of stores, hotels, etc. that is owned by the same person or company: a chain of restaurants a hotel chain3chain of events a series of related events or actions: A complicated chain of events led to World War I.4[countable] a series of similar things in a line: a mountain chain a chain of islands5in chains prisoners in chains have heavy chains fastened around their legs or arms, to prevent them from escaping [Origin: 1200–1300 Old French chaeine, from Latin catena]