religious (adj.)

c. 1200, "devout, pious, imbued with or expressive of religious devotion," from Anglo-French religius, Old French religious (12c., Modern French religieux) and directly from Latin religiosus, from religio (see religion). Meaning "pertaining to religion" is from 1530s. Transferred sense of "scrupulous, exact" is recorded from 1590s. Related: Religiousness.

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Definitions of religious from WordNet
religious (adj.)
concerned with sacred matters or religion or the church;
religious texts
a member of a religious order
Synonyms: spiritual
religious (adj.)
having or showing belief in and reverence for a deity;
a religious man
religious attitude
religious (adj.)
of or relating to clergy bound by monastic vows;
the religious or regular clergy conducts the service
religious (adj.)
extremely scrupulous and conscientious;
religious in observing the rules of health
religious (n.)
a member of a religious order who is bound by vows of poverty and chastity and obedience;