*let·ter/`lɛtə; ˈletə/ n 1 [C] a written message that you put into an envelope and send to someone 信: Could you post this letter for me? 你替我把这封信寄出好吗？ 2 [C] one of the signs in writing that is used to mean a sound in speech 字母: the letter A 字母 A 3 do sth to the letter to do exactly what you are told to do 严格按照指示做某事: He followed their instructions to the letter. 他严格地执行他们的指示。