letter

The word "letter" usually points in two main directions, and both are part of everyday English. First, it can mean a written or printed message sent from one person or group to another. This may be personal, like a note to a family member, or formal, like a business letter, a letter of complaint, or a letter of recommendation. In this sense, it is a piece of communication, often on paper and often sent by mail, though the idea can also extend to official written messages more generally.

Second, "letter" means one of the characters of an alphabet, such as A, B, or C. These are the basic signs used to build words, sentences, and whole texts. Children learn letters when they begin reading and writing, and adults still talk about letters when they spell names, check grammar, or describe how a word is written.

There are also a few extended uses. In formal settings, "letter" can mean an official written document, as in a letter of intent or a cover letter. In the phrase "to the letter," it means the exact words or exact instructions, followed very closely. In American English, especially in school sports, "a letter" can also be an award showing that a student played for a school team.

So the word moves easily between language and communication: it can be a message someone sends, a single sign in the alphabet, or an official written document, depending on the context.