Actually, antidisestablishmentarianism is the belief held by those who are against people who are against the unity of the Church of England and the Monarchy.
*Anti*-Against, *Dis*-the removal of
*Establishment*-the Monarchy and Church
*Arian*-person or group,
For those who are actually interested, antidisestablishmentarianism is a political line of thought against the disestablishment of a state religion, like the Church of England (where it originated).