Definition of "ecumenical"

Within Europe, the church's ecumenical partnerships have demonstrated that ecclesial unity may have political resonances.

1999 June 5, Martyn Percy, “St Albion's Utd”, in The Guardian‎, London, retrieved 29 January 2022

Nicaea has always been regarded as one of the milestones in the history of the Church, and reckoned as the first council to be styled ‘general’ or ‘oecumenical’.

2009, Diarmaid MacCulloch, A History of Christianity: The First Three Thousand Years, Penguin, published 2010, page 215

Rather touchingly, an ecumenical mass of reparation for the victims of the massacres was held on October 29, in the very English village of Great Missenden in Buckinghamshire. The service was led by the Catholic bishop of Northampton, with Archbishop Metropolitan Stres from Ljubljana and the Anglican bishop of Buckingham.

2010 October 30, “Britain's Ancient Shame in Slovenia”, in The Economist, London