/sɪˈsi:d ||; sɪˈsid/verb [I] secede (from sth)(formal 正式) (used about a state, country, etc 指州、国家等) to officially leave an organization of states, countries, etc and become independent 退出，脱离（联邦、同盟等）: The Republic of Panama seceded from Colombia in 1903. 巴拿马共和国于1903年脱离哥伦比亚独立。