'Congregationalist' definitions:

Definition of 'Congregationalist'

From: WordNet
adjective
Of or pertaining to or characteristic of a Congregational church [syn: Congregational, Congregationalist]
noun
A member of the Congregational Church

Definition of 'Congregationalist'

From: GCIDE
  • Congregationalist \Con`gre*ga"tion*al*ist\, n. One who belongs to a Congregational church or society; one who holds to Congregationalism. [1913 Webster]