Other forms: tolerations
Toleration is the practice of allowing or putting up with something, especially if you disagree with it. Religious toleration is an important founding principle of the United States.
When you tolerate something, allowing it to exist without interfering, you could say you're practicing either toleration or tolerance. Toleration tends to be used when this permission is more reluctant; if the majority of a nation's citizens practice one religion, and they very grudgingly allow other minority religions to be practiced, that's toleration. Originally defined as "permission granted by authority," toleration has a Latin root meaning "to bear or endure."