The state in which two surfaces are held together by interfacial forces which may consist of molecular forces or interlocking action, or both.

The clinging or sticking of two (2) material surfaces to one another. In rubber parlance, the strength of bond or union between two (2) rubber surfaces or plies cured or uncured. The bond between a cured rubber surface and a nonrubber surface, e.g., glass, metal, wood, fabric.