The Illuminati (plural form of Latin illuminatus, or "enlightened") is a name given to several groups, both historical and modern… and both real and fictitious. In modern times it is also used to refer to a purported conspiratorial organization which acts as a shadowy "power behind the throne", allegedly controlling world affairs through present day governments and corporations. In this context, the Illuminati are believed to be the masterminds behind events that will lead to the establishment of a New World Order.
Within Our World, the Illuminati are also a generalized name given to the more (or less…) mortal factions of occult and supernatural lore keepers and guardians. While officially under no one's purview but their own, each of the smaller organizations keeps ties with each other, and consider themselves as a group a power on the scale of the Trimagus Council.