Meaning of “letter” in the English Dictionary

"letter" in British English

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letternoun [ 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.

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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

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Idiom(s)

letteradjective [ before noun ]

uk /ˈlet.ər/ us /ˈlet̬.ɚ/ US

(Definition of “letter” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"letter" in American English

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letternoun [ C ]

us /ˈlet̬·ər/

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)

"letter" in Business English

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letternoun [ C ]

uk /ˈletər/ us

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.

letteradjective [ before noun ]

uk /ˈletər/ us

US →  letter-size

(Definition of “letter” from the Cambridge Business English Dictionary © Cambridge University Press)