Adhesionis a characteristic in all adhesives; the force required to remove a label from a substrate after a specified period of time.
It is also the state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking action, or both; bonding strength; the attraction of a coating to the substrate, or of one coat of paint to another. It can also refer to the soil quality of sticking to buckets, blades, and other parts of excavators