Definition of pen

• n. - A feather.
• n. - A wing.
• 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.
• n. - Fig.: A writer, or his style; as, he has a sharp pen.
• n. - The internal shell of a squid.
• n. - A female swan.
• v. t. - To write; to compose and commit to paper; to indite; to compose; as, to pen a sonnet.
• 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.
• n. - A small inclosure; as, a pen for sheep or for pigs.