* Formal: The conference brought together theologians from various Christian denominations for an ecumenical discussion on interfaith dialogue.
* Informal: The local church hosted an ecumenical Christmas service, inviting members of all faiths to join in the celebration.
* Specific: The ecumenical movement has gained momentum in recent years, fostering greater understanding and cooperation between different Christian traditions.
* Historical: The ecumenical council in the 1960s marked a significant shift in the Catholic Church's relationship with other Christian denominations.
Let me know if you'd like to see more examples!