"adherent of the principle of an established church," 1839, from establishment + -arian. Related: Establishmentarianism (1846).
Entries linking to establishmentarian
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; Emerson also seems to have used it once in more or less that sense.