• (n.) The state or quality of being adherent; adherence. • (n.) That which adheres.
Ad·her'en·cy noun 1. The state or quality of being adherent; adherence. [ R.] 2. That which adheres. [ Obsolete] Dr. H. More. 
adherency 1. The action of sticking or holding fast (to anything, or together). 2. Attachment (to a person or party); adhesion. 3. Persistence in a practice or tenet; steady observance or maintenance.