A member of a religious body who is (often, although not always, of the clergy) officially assigned to provide pastoral care at an institution, group, private chapel, etc.
A person without religious affiliation who carries out similar duties in a secular context.
A cleric; someone (such as a priest) who administers a church (ecclesia) or other religious gathering/group.
A member of the Athenian ecclesia (public legislative assembly).
A member of any ecclesia (church or other assembly).