letter

(noun) a written message addressed to a person or organization. Synonyms: missive. Example: "Mailed an indignant letter to the editor."

(noun) the conventional characters of the alphabet used to represent speech. Synonyms: letter of the alphabet, alphabetic character. Example: "His grandmother taught him his letters."

(noun) owner who lets another person use something (housing usually) for hire.

(noun) a strictly literal interpretation (as distinct from the intention). Examples: "He followed instructions to the letter." "He obeyed the letter of the law."

(noun) an award earned by participation in a school sport. Synonyms: varsity letter. Example: "He won letters in three sports."

(verb) win an athletic letter.

(verb) set down or print with letters.

(verb) mark letters on or mark with letters.