(1):

(n.) A wing.

(2):

(n.) The internal shell of a squid.

(3):

(n.) A female swan.

(4):

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

(5):

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

(6):

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

(7):

(n.) A feather.

(8):

(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.

(9):

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