Definition of "letter" [let•ter]

• A written symbol or character representing a speech sound and being a component of an alphabet. (noun)
• A written symbol or character used in the graphemic representation of a word, such as the h in Thames. See Note at Thames. (noun)
• A written or printed communication directed to a person or organization. (noun)
• A certified document granting rights to its bearer. Often used in the plural. (noun)
• Literal meaning: had to adhere to the letter of the law. (noun)
• Any of a set of conventional symbols used in writing or printing a language, each symbol being associated with a group of phonetic values in the language; character of the alphabet (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• A written or printed communication addressed to a person, company, etc, usually sent by post in an envelope (noun)
• A style of typeface (noun)
• To write or mark letters on (a sign, etc), esp by hand (verb)
• To set down or print using letters (verb)

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• "But in sharply-worded letter written this week, Senate Homeland Security Committee chairs Susan Collins (R-ME) and Joe Lieberman (D-CT) say the “letter of assurance” did no such thing."
• "Cos I got Jillehpie's letter fine and Sophiepie's is lost somewhere. * calls out to letter* meh. * stamps feet* I WANT SOPHS LETTER!!"
• "The second letter has a date line, personal signature and initials of dictator and stenographer -- little touches that add to the personality of the letter_"