change change: /tʃeɪn(d)ʒ/ verb 1. make or become different. “a proposal to change the law” alter in terms of. “the ferns began to change shape.” synonyms: alter, make different, become different, undergo a change. 2. take or use another instead of. synonyms: swap, exchange, interchange, substitute, switch, commute, convert, replace. noun 1. an act or process through which something becomes different.