Conciliarity refers to the adherence of various Christian communities to the authority of ecumenical councils and to synodal church government. It is not to be confused with conciliarism, which refers to a particular historical movement within the Catholic Church. Different churches interpret conciliarity different ways.
Read more about Conciliarity: Conciliarity in The Catholic Church, Conciliarity in The Eastern (Apostolic, Non-Catholic) Churches, Conciliarity in Anglican, Protestant and Other Churches