What is the meaning of the word "binding"?

Definitions:

  1. executed with proper legal authority copy to clipboard adjective
    • a binding contract copy to clipboard
  2. one of a pair of mechanical devices that are attached to a ski and that will grip a ski boot copy to clipboard noun
    • the bindings should release in case of a fall copy to clipboard
  3. the protective covering on the front, back, and spine of a book copy to clipboard noun
    • the book had a leather binding copy to clipboard

Synonyms: