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English definition of “letter”

letter

noun [C]  /ˈlet̬·ər/ us  

letter noun [C] (MESSAGE)

a written or printed message from one person to another, usually put in an envelope and delivered as mail: I got a letter from the bank this morning.

letter noun [C] (SYMBOL)

any of the set of symbols used to write a language, in many languages, representing a sound in the language: She wrote her name on the board in large letters.
(Definition of letter from the Cambridge Academic Content Dictionary © Cambridge University Press)
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