[de-fee-de; English dee-fi-dee]
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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
RC Church (of a doctrine) belonging to the essentials of the faith, esp by virtue of a papal ruling
Word Origin for de fide
literally: from faith
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012