› COMMUNICATIONS a written message from one person to another, usually put in an envelope and sent by mail: by letter You will receive an acknowledgement by letter.get/receive a letter (from sb) I got a letter from my lawyer this morning.deliver/post/send a letter I sent a letter about the problem to HQ last week.draft/write/sign a letter The letter was signed by the managing director.reply to/acknowledge/answer a letter I wrote to the company but they did not even acknowledge my letter.a confirmation/rejection/warning letter You will receive a confirmation letter within 10 working days.an accompanying/a covering letter Please find enclosed my CV and a covering letter.a formal/an informal letter He wrote a formal letter of resignation. The letter was addressed to John Clarke. a letter dated 3rd March 2010
› any of the set of symbols used to write a language, representing a sound in the language: the letter D an upper-case/lower-case letter (= A/a or B/b)
the letter of the law formal › LAW the exact words of a law and not its more important general meaning: The bank was operating within the letter of the law.
to the letter › if you obey instructions or rules to the letter, you do exactly what you have been told to do, giving great attention to every detail: I followed the instructions to the letter and it still went wrong. → See also allocation letter, application letter, appointment letter, bank authorization letter, commitment letter, covering letter, cover letter, credit dispute letter, engagement letter, form letter, letter of comfort, regret letter