Source : Webster's Revised Unabridged Dictionary (1913)

Auto-da-f'e \Au"to-da-f['e]"\, n.; pl. {Autos-da-f['e]}. [Pg.,
   act of the faith; auto act, fr. L. actus + da of the + f['e]
   faith, fr. L. fides.]
   1. A judgment of the Inquisition in Spain and Portugal
      condemning or acquitting persons accused of religious
      offenses.

   2. An execution of such sentence, by the civil power, esp.
      the burning of a heretic. It was usually held on Sunday,
      and was made a great public solemnity by impressive forms
      and ceremonies.

   3. A session of the court of Inquisition.