Definition of act of faith in English:

act of faith

noun

  • 1An act requiring or demonstrating (religious) faith.

  • 2historical
    Specifically = auto-da-fé. Also †act of the faith. Now historical.

Origin

Early 16th century; earliest use found in William Tyndale (c1494–1536), translator of the Bible and religious reformer. From act + of + faith.

Pronunciation:

act of faith

/ˌakt əv ˈfeɪθ/