Fides ecclesiastica is a classification of those Roman Catholic dogmas which are Church teachings, definitively decided on by the Magisterium

Magisterium

In the Catholic Church the Magisterium is the teaching authority of the Church. This authority is understood to be embodied in the episcopacy, which is the aggregation of the current bishops of the Church in union with the Pope, led by the Bishop of Rome , who has authority over the bishops,...

, but not believed to be Divine revelations. They are considered infallible and irrevocable.

It is one level below De fide

De fide

De fide is a "theological note" or "theological qualification" that indicates that some religious doctrine is an essential part of Catholic faith and that denial of it is heresy....

 and one level above Sententia fidei proxima which are generally accepted as divine revelation but not defined as such by the Magisterium

Magisterium

In the Catholic Church the Magisterium is the teaching authority of the Church. This authority is understood to be embodied in the episcopacy, which is the aggregation of the current bishops of the Church in union with the Pope, led by the Bishop of Rome , who has authority over the bishops,...

.

Sources

• Avery Dulles, The Survival of Dogma, Faith, authority and dogma in a changing world, Image Books, New York, 1970