Fides ecclesiastica
Fides ecclesiastica is a classification of those Roman Catholic dogmas which are Church teachings, definitively decided on by the Magisterium, but not as being Divine revelations properly speaking. They are considered infallible and irrevocable because, although they are not "truths of faith", they are nevertheless "closely related to them".
It is one level below De fide and one level above Sententia fidei proxima which are generally accepted as divine revelation but not defined as such by the Magisterium.
An example for a Catholic teaching that has this rank at present, but might conceivably yet be taught as de fide in the future, is male-only priesthood. An example for a Catholic teaching that also has this rank but cannot possibly be taught as de fide in the future would be, for instance, the fact that the Jansenist book Augustinus actually contains the heresies the Church condemned it for.
