n. & adj.
--n.
1. a supporter of a party, person, etc.
2 a devotee of an activity.
--adj.
1. (foll. by to) faithfully observing a rule etc.
2 (often foll. by to) (of a substance) sticking fast.
Derivatives:
adherence n.
Etymology: F adh{eacute}rent (as ADHERE)