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.
With willing trust in another: You'll have to accept my promise on faith.
[Middle English, from Anglo-Norman fed, from Latin fidēs; see bheidh- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.