Catechism of the Catholic Church §1924 — excerpt
The common good comprises "the sum total of social conditions which allow people, either as groups or as individuals, to reach their fulfillment more fully and more easily" (GS 26 1).
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.