开 kāi to open (transitive or intransitive)(of ships, vehicles, troops etc) to startto turn on; to put in operation; to operate; to runto boilto write out (a prescription, check, invoice etc)(directional complement) away; offcarat (gold)abbr. for Kelvin, 开尔文 Kāi ěr wénabbr. for 开本 kāi běn, book format