Definitions of binding:

• noun:   the front and back covering of a book

  Example: "The book had a leather binding"

• noun:   strip sewn over or along an edge for reinforcement or decoration
• noun:   the capacity to attract and hold something
• noun:   the act of applying a bandage
• adjective:   hindering freedom of movement

  Example: "Tight garments are uncomfortably binding"

• adjective:   executed with proper legal authority

  Example: "A binding contract"

• adjective:   causing constipation