letter - definition and synonyms

noun [countable] 

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  1. 1
    a message that you write on a piece of paper and send to someone
    letter to:

    a letter to a friend

    get/receive a letter from someone:

    I get letters from them every week.

    write a letter:

    Most of the soldiers wrote long letters home.

    send (someone) a letter:

    I sent them a letter complaining about it.

    letter of:

    a letter of thanks/resignation/recommendation