Source : Webster's Revised Unabridged Dictionary (1913)

Sign \Sign\, v. t. [imp. & p. p. {Signed}; p. pr. & vb. n.
   {Signing}.] [OE. seinen to bless, originally, to make the
   sign of the cross over; in this sense fr. ASS. segnian (from
   segn, n.), or OF. seignier, F. signer, to mark, to sign (in
   sense 3), fr. L. signare to mark, set a mark upon, from
   signum. See {Sign}, n.]
   1. To represent by a sign; to make known in a typical or
      emblematic manner, in distinction from speech; to signify.

            I signed to Browne to make his retreat. --Sir W.
                                                  Scott.

   2. To make a sign upon; to mark with a sign.

            We receive this child into the congregation of
            Christ's flock, and do sign him with the sign of the
            cross.                                --Bk. of Com
                                                  Prayer.

   3. To affix a signature to; to ratify by hand or seal; to
      subscribe in one's own handwriting.

            Inquire the Jew's house out, give him this deed, And
            let him sign it.                      --Shak.

   4. To assign or convey formally; -- used with away.

   5. To mark; to make distinguishable. --Shak.

Source : WordNet®

signed
     adj 1: having a handwritten signature; "a signed letter" [ant: {unsigned}]
     2: used of the language of the deaf [syn: {gestural}, {sign(a)},
         {sign-language(a)}]