n. 1 the act or process of adhering. 2 the capacity of a substance to stick fast. 3 Med. an unnatural union of surfaces due to inflammation. 4 the maintenance of contact between the wheels of a vehicle and the road. 5 the giving of support or allegiance. °More common in physical senses (e.g. the glue has good adhesion), with adherence used in abstract senses (e.g. adherence to principles).
[ F adhésion or L adhaesio (as ADHERE) ]