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1. Confident belief in the truth, value, or trustworthiness of a person, idea, or thing.
2. Belief that does not rest on logical proof or material evidence. See synonyms at belief, trust.
3. Loyalty to a person or thing; allegiance: keeping faith with one's supporters.
4. often Faith Christianity. The theological virtue defined as secure belief in God and a trusting acceptance of God's will.
5. The body of dogma of a religion: the Muslim faith.
6. A set of principles or beliefs.

in faith

1. Indeed; truly.

[Middle English, from Anglo-Norman fed, from Latin fidēs.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.