Of or relating to Brownism or Brownists; characteristic of the religious movement advocating independent congregations.
From brownist plus -ic suffix making it adjectival. Adds a descriptive layer to the noun referring to the movement's followers.
Adding -ic to nouns to make adjectives is a classic Latin-influenced pattern in English (like 'democratic' from 'democrat'), and it lets us describe things as 'having the qualities of' a movement.
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