1. confidence or trust in a person or thing: faith in another's ability.
2. belief that is not based on proof: He had faith that the hypothesis would be substantiated by fact.
3. belief in God or in the doctrines or teachings of religion: the firm faith of the Pilgrims.
4. belief in anything, as a code of ethics, standards of merit, etc.: to be of the same faith with someone concerning honesty.
5. a system of religious belief: the Christian faith; the Jewish faith.
8. Christian Theol. the trust in God and in His promises as made through Christ and the Scriptures by which humans are justified or saved.

* Excerpted from the Random House Webster's Unabridged Dictionary 3.0.