a. Belief in God or in a set of religious doctrines.
b. A set of religious doctrines; a body of dogma: adhered to the Muslim faith.
c. often Faith Christianity Secure belief in God and a trusting acceptance of God's will viewed as a theological virtue.
2. Confident or unquestioning belief in the truth, value, or trustworthiness of a person, idea, or thing. See Synonyms at belief, trust.
3. Loyalty to a person or thing; allegiance: keeping faith with one's supporters; refused to break faith with his friends.
[Middle English, from Anglo-Norman fed, from Latin fidēs; see bheidh- in the Appendix of Indo-European roots.]
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