Adhesion

[1] The force which causes two surfaces to stick together
[2] The sticking together of surfaces in contact with each other
[3] The bonding of materials with adhesives (glues, cements, binders, etc), in which the intermolecular forces between adhesive and adherend provide the bonds.
[4] The sticking together of two metals as a result of compressing them together
[5] The sticking together of two dissimilar metals because of electrical transference of electrons.
See also cold welding
[6] The ability of paint, primer, or glue to stick to the surface to which it is applied.
[7] The ability of a tire to grip the surface of the road.
[8] Mutual forces between two magnetic bodies linked by magnetic flux, or between two charged non-conducting bodies which keeps them in contact
[9] Intermolecular forces which hold matter together, particularly closely contiguous surfaces of neighboring media, e.g., liquid in contact with a solid.
See also intercoat adhesion failure, limits of adhesion