1. A political belief that was opposed to the separation of a religious group, or church, from a state or its authority: Antidisestablishmentarianism was the view held by those who were opposed to disconnecting the Anglican church from the civil government, or to refer to the division of church and state in England in the 19th century.
2. The word is especially noted for its unusual length: Antidisestablishmentarianism is one of the longest words in the English language and consists of twenty-eight letters and twelve syllables!