What is the meaning of indorsement?

noun

• A promotional statement (as found on the dust jackets of books. )
  • usage: "the author got all his friends to write blurbs for his book"
  • synonyms: endorsement, blurb
• A speech seconding a motion.
  • usage: "do I hear a second"
  • synonyms: second, secondment, endorsement
• Formal and explicit approval.
  • usage: "a Democrat usually gets the union's endorsement"
  • synonyms: sanction, countenance, endorsement, warrant, imprimatur
• A signature that validates something.
  • usage: "the cashier would not cash the check without an endorsement"
  • synonyms: endorsement
• The act of endorsing.
  • usage: "a star athlete can make a lot of money from endorsements"
  • synonyms: endorsement