1. (n.) A feather.

2. (n.) A wing.

3. (n.) An instrument used for writing with ink, formerly made of a reed, or of the quill of a goose or other bird, but now also of other materials, as of steel, gold, etc. Also, originally, a stylus or other instrument for scratching or graving.

4. (n.) Fig.: A writer, or his style; as, he has a sharp pen.

5. (n.) The internal shell of a squid.

6. (n.) A female swan.

7. (v. t.) To write; to compose and commit to paper; to compose; as, to pen a sonnet.

8. (n. & v.) To shut up, as in a pen or cage; to confine in a small enclosure or narrow space; to coop up, or shut in; to enclose.

9. (n.) A small enclosure; as, a pen for sheep or for pigs.