noun

1. LETTER, a written message addressed to a person or organization
2. LETTER, an award earned by participation in a school sport
3. LETTER, the conventional characters of the alphabet used to represent speech
4. LETTER, a strictly literal interpretation (as distinct from the intention)
5. LETTER, owner who lets another person use something (housing usually) for hire
6. LETTER, to write or print letters on (something) : to mark (something) with letters
7. LETTER, to earn a school letter for playing on a sports team

verb

1. LETTER, mark letters on or mark with letters
2. LETTER, set down or print with letters
3. LETTER, win an athletic letter