GNU Collaborative International Dictionary of English

Found one definition

1.       
   auto-da-fe, ‖Auto-da-fé , n.; pl. Autos-da-fé . [Pg., act of the faith; auto act, fr. L. actus + da of the + fé faith, fr. L. fides.]
   A judgment of the Inquisition in Spain and Portugal condemning or acquitting persons accused of religious offenses.
   1913 Webster
   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.
   1913 Webster
   Hence: [Fig.] The public denunciation or punishment of a person who has offended the prevailing authorities.
   PJC
   A session of the court of Inquisition.
   1913 Webster