Definition of letter:

• To impress or form letters on. Dead letter. See Dead- letter. Letter of attorney. See Attorney. Letter of credit. See Credit. Letter of marque. See Marque. Letters patent, a writing executed and sealed, by which power and authority are granted to a person to do some act or enjoy some right.
• To stamp or mark with letters.
• Learning; erudition.
• A mark or character, representative of a sound; a written or printed message, or communication sent by post or otherwise; the literal meaning; printing type.
• A mark or character representing a sound or an element of speech; a written or printed message; an epistle; a character formed of metal or wood, used in printing books.

Usage examples for letter

1. You would have seen that if you had read the letter.  Cecilia de Noël by Lanoe Falconer

2. There were no committals in the letter.  A Canadian Bankclerk by J. P. Buschlen

3. Well, then, I thought, if Fruen knows about the letter, then Captain surely knows too.  Wanderers by Knut Hamsun

4. The letter is here.  The Master Mummer by E. Phillips Oppenheim