ad·here / adˈhi(ə)r/ • v. [intr.] (adhere to) stick fast to (a surface or substance): paint won't adhere well to a greasy surface. ∎  believe in and follow the practices of: the people adhere to the Muslim religion. ∎  represent truthfully and in detail: the account adhered firmly to fact.

adhere XVI. — (O)F. adhérer or L. adhærēre, f. AD- + hærēre stick.
So adherent adj. XIV; sb. XV. — (O)F. adhérent — L. adhærent-. adhesion XVII. — F. adhésion or L. adhæsiō, -ōn-, f. adhæs-, pp. stem of adhærēre.