Catechism of the Catholic Church §1744 — excerpt
Freedom is the power to act or not to act, and so to perform deliberate acts of one's own. Freedom attains perfection in its acts when directed toward God, the sovereign Good.
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.