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antidisestablishmentarianism (n.): "opposition to disestablishment of the Church of England," 1838, said by Weekley to be first recorded in Gladstone's "Church and State," from dis- + establishment in the sense of "the ecclesiastical system established by law; the Church of England" (1731). Hence establishmentarianism "the principle of a state church" (1846) and disestablish (1590s) "to deprive (a church) of especial state patronage and support" (first used specifically of Christian churches in 1806), which are married in this word. Rarely used at all now except in examples of the longest words, amongst which it has been counted at least since 1901.
establishment (n.): late 15c., "settled arrangement," also "income, property," from establish + -ment. Meaning "established church" is from 1731; Sense of "place of business" is from 1832. Meaning "social matrix of ruling people and institutions" is attested occasionally from 1923, consistently from 1955.
establishmentarian (n.): "adherent of the principle of an established church," 1839, from establishment + -arian. Related: Establishmentarianism (1846).