n.
written message
1) to type; write a letter
2) to mail. post (BE), send a letter
3) to drop a letter into a mailbox (AE), letter box (BE)
4) to certify; register a letter
5) to take (down), transcribe a letter
6) to dictate a letter
7) to deliver; forward a letter
8) to get, receive a letter
9) a brief; detailed; long; rambling letter
10) an anonymous; business; chain; fan; follow-up; form; love; open; pastoral; personal; poison-pen letter
11) an airmail; certified; dead; express; registered; special-delivery letter
12) the letters crossed in the mail (esp. AE), post (BE)
13) a letter about
14) a letter from; to (we received a letter from her about the incident)
15) in a letter
unit of an alphabet
16) a block; capital, large, upper-case; lower-case, small letter
first letter of the name of a school, college denoting membership on a sports team
(AE)
17) to earn, win one's letter
18) a school letter