1. Relating to, or referring to, a get-together or gathering of people, animals, or things: An excessive congregational flock of birds were harming the wheat fields of the local farmers.
2. Pertaining to, or adhering to, a form of Protestant church government in which each local church acts as an independent, self-governing body; while maintaining fellowship with related religious believers: Thousands of members of Congregational churches were convening for special worship services.