noun an ecclesiastic who has a chapel, or who performs religious service in a chapel.
2. chaplain ·noun any person (clergyman or layman) chosen to conduct religious exercises for a society, ·etc.; as, a chaplain of a masonic or a temperance lodge.
3. chaplain ·noun a clergyman who is officially attached to the army or navy, to some public institution, or to a family or court, for the purpose of performing divine service.