Webster's Revised Unabridged Dictionary · 1913

Religious

Religious (r?-l?j"?s) , adjective

[Old French religius, religious, French religieux, from Latin religiosus. See Religion.]

1.
Of or pertaining to religion; concerned with religion; teaching, or setting forth, religion; set apart to religion; as, a religious society; a religious sect; a religious place; religious subjects, books, teachers, houses, wars.
Our law forbids at their religious rites My presence. — Milton
2.
Possessing, or conforming to, religion; pious; godly; as, a religious man, life, behavior, etc.
Men whose lives Religious titled them the sons of God. — Mlton
3.
Scrupulously faithful or exact; strict.
Thus, Indianlike, Religious in my error, I adore The sun, that looks upon his worshiper. — Shakespeare
4.
Belonging to a religious order; bound by vows.
One of them is religious. — Chaucer

Religious , noun

A person bound by monastic vows, or sequestered from secular concern, and devoted to a life of piety and religion; a monk or friar; a nun. — Addison