Encyclical (noun)

1. A letter or message issued by a Pope or bishop and intended for distribution to all members of the church.
2. A circular letter, especially one on a matter of official Church business.
3. An authoritative letter or announcement sent to a large group of people.

Origin:

Derived from the greek word enkyklios (circular), which was used to describe circular letters sent by a bishop to members of his diocese.

Examples:

1. Pope Francis recently issued an encyclical on the environment and human ecology.
2. The encyclical was read in all churches throughout the world.
3. The bishop's encyclical was a call to action for all members of the diocese.
4. Many view the Pope's encyclical as a response to the current environmental crisis.
5. The encyclical was met with both praise and criticism from various religious groups.