adherent

adj

1. Adhesive, sticking to something.

   “Close to the cliff with both his hands he clung And stuck adherent, and suspended hung.”

2. Having the quality of clinging or sticking fast to something.
3. Attaching or pressing against a different organ.
4. Showing adherence to a treatment.

   “Half (49.9%) of patients were adherent to their regimens, 42.6% were underadherent, and 7.6% had medication oversupply.”

noun

1. A person who has membership in some group, association, or religion.

   “While the concept of remigration has long existed in academia, its hijacking by the far right on social media appears to have begun about a decade ago when French adherents to identitarianism, an ethno-nationalist movement, organised what they described as the inaugural meeting in Paris on remigration.”