Definitions of endorsement:

• noun:   the act of endorsing

  Example: "A star athlete can make a lot of money from endorsements"

• noun:   a signature that validates something

  Example: "The cashier would not cash the check without an endorsement"

• noun:   a promotional statement (as found on the dust jackets of books)
• noun:   formal and explicit approval

  Example: "A Democrat usually gets the union's endorsement"

• noun:   a speech seconding a motion