A property of a substance that describes its ability to stick to another material, either mechanically or chemically, as in the ability of a printing ink to adhere to the surface of a paper. (See also Cohesion.) The term ultimate adhesion is used to refer to the strength of the bond produced by an adhesive substance. See also Mechanical Adhesion, Peel Adhesion, Shear Adhesion, Specific Adhesion, Ultimate Adhesion, and Adhesive.