Meaning of de fide*

de fi•de

Pronunciation: (de-fē'de Eng. dē-fi'dē), [key]
— Latin. Latin.
  1. of the faith: a phrase used in the Roman Catholic Church to qualify certain teachings as being divinely revealed, belief in them therefore being obligatory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.