Source : Webster's Revised Unabridged Dictionary (1913)

Indorsement \In*dorse"ment\, n. [From {Indorse}; cf.
   {Endorsement}.] [Written also {endorsement}.]
   1. The act of writing on the back of a note, bill, or other
      written instrument.

   2. That which is written on the back of a note, bill, or
      other paper, as a name, an order for, or a receipt of,
      payment, or the return of an officer, etc.; a writing,
      usually upon the back, but sometimes on the face, of a
      negotiable instrument, by which the property therein is
      assigned and transferred. --Story. Byles. Burrill.

   3. Sanction, support, or approval; as, the indorsement of a
      rumor, an opinion, a course, conduct.

   {Blank indorsement}. See under {Blank}.

Source : WordNet®

indorsement
     n 1: a promotional statement (as found on the dust jackets of
          books); "the author got all his friends to write blurbs
          for his book" [syn: {endorsement}, {blurb}]
     2: a speech seconding a motion; "do I hear a second?" [syn: {second},
         {secondment}, {endorsement}]
     3: formal and explicit approval; "a Democrat usually gets the
        union's endorsement" [syn: {sanction}, {countenance}, {endorsement},
         {warrant}, {imprimatur}]
     4: a signature that validates something; "the cashier would not
        cash the check without an endorsement" [syn: {endorsement}]
     5: the act of endorsing; "a star athlete can make a lot of
        money from endorsements" [syn: {endorsement}]