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English definition of “letter”

letter

noun [C] uk   /ˈlet.ər/ us    /ˈlet̬.ɚ/

letter noun [C] (MESSAGE)

A1 a written message from one person to another, usually put in an envelope and sent by post: I got a letter from the bank this morning.

letter noun [C] (SYMBOL)

A2 any of the set of symbols used to write a language, representing a sound in the language: the letter D the letter of the law formal the exact words of the law and not its more important general meaning

letter

adjective [before noun] uk   /ˈlet.ər/ us    /ˈlet̬.ɚ/ US
used to refer to a standard size of paper in the US, 8.5 inches by 11 inches: Fliers are usually printed either on letter size or legal size paper.
(Definition of letter from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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