the action of sticking; the state of being attached; intimate union; as, the adhesion of glue, or of parts united by growth, cement, or the like.-adherence; steady or firm attachment; fidelity; as, adhesion to error, to a policy.-agreement to adhere; concurrence; assent.-the molecular attraction exerted between bodies in contact. see cohesion.-union of surface, normally separate, by the formation of new tissue resulting from an inflammatory process.-the union of parts which are separate in other plants, or in younger states of the same plant.