* Kusa (pronounced koo-sah) - This is the most common and direct translation. It emphasizes the free will and choice involved.
* Pagkukusa (pronounced pahg-koo-koo-sah) - This is a more formal and literary translation, literally meaning "the act of being voluntary."
The best translation will depend on the context. If you are talking about a person's free will, "kusa" would be the most appropriate. If you are talking about a legal or formal concept, "pagkukusa" might be more fitting.