Catechism of the Catholic Church §777 — excerpt
The word "Church" means "convocation." , gathers together to form the People of God, and who themselves, nourished with the Body of Christ, become the Body of Christ.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.