Definition of "Binding" :

noun: the act of applying a bandage

noun: the protective covering on the front, back, and spine of a book

"The book had a leather binding."

noun: strip sewn over or along an edge for reinforcement or decoration

noun: one of a pair of mechanical devices that are attached to a ski and that will grip a ski boot; the bindings should release in case of a fall

noun: the capacity to attract and hold something

adjective: executed with proper legal authority

"A binding contract."