letter /ˈletə/ n.［c］ 1.信：Inform me by letter of your plan.用信件通知我你的计划；write (a letter) to sb. 给某人写信；answer/reply to (date, sign, post/mail) a letter 回信 (在信上注明日期，在信上签名，寄信); pay serious attention to letters from the people 重视人民来信 2.字母：a capital (small) letter大(小)写字母 3. 用于习语 to the letter 恪守（指令、规则等）：I followed the instructions to the letter and it still went wrong.我恪守指令，但仍然错了。
letter-box n. [c] 信筒（=pillar-box），信箱：He dropped the letter into the letter-box.他把信丢进邮筒内。She opened the letter-boxand slipped a newspaper through. 她打开信箱把报纸塞了进去。
