Encyclical

An encyclical was originally a circular letter sent to all the churches of a particular area in the ancient Roman Church. At that time, the word could be used for a letter sent out by any bishop. The word comes from the Late Latin encyclios (originally from the Latin encyclius, a Latinization of Greek ἐνκύκλιος (enkyklios), meaning "circular", "in a circle", or "all-round", also part of the origin of the word encyclopedia). The term is now primarily associated with papal encyclicals.

The term has been used by Catholics, Anglicans and the Eastern Orthodox Church.