Congregational \Con`gre*ga"tion*al\, a.

1. Of or pertaining to a congregation; conducted, or participated in, by a congregation; as, congregational singing.

2. Belonging to the system of Congregationalism, or to Congregationalist; holding to the faith and polity of Congregationalism; as, a Congregational church.

Source: Webster's Revised Unabridged Dictionary (1913)