The Collaborative International Dictionary of English v.0.48:

Pen \Pen\, v. t. [imp. & p. p. Penned; p. pr. & vb. n.
   Penning.]
   To write; to compose and commit to paper; to indite; to
   compose; as, to pen a sonnet. "A prayer elaborately penned."
   --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pen \Pen\, v. t. [imp. & p. p. Pennedor Pent (?); p. pr. &
   vb. n. Penning.] [OE. pennen, AS. pennan in on-pennan to
   unfasten, prob. from the same source as pin, and orig.
   meaning, to fasten with a peg.See Pin, 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. "Away with her, and pen her up." --Shak.
   [1913 Webster]

         Watching where shepherds pen their flocks at eve.
                                                  --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Penned \Penned\, a.
   1. Winged; having plumes. [Obs.]
      [1913 Webster]

   2. Written with a pen; composed. "Their penned speech."
      --Shak.
      [1913 Webster]

   3. Enclosed in a pen; -- of animals.
      [PJC]