Historically, the word was originally used in the context of large ecumenical councils that were organized under the auspices of Roman Emperors to clarify matters of Christian theology and doctrine.
These "Ecumenical Councils" brought together bishops from around the inhabited world (such as, οἰκουμένη) as they knew it at the time.
They are genuinely “inter-church” organizations, in a way that IVF is not.
But a denomination has, I think, no more or less biblical rationale for existence than IVF does.
The adjective ecumenical can also be applied to any interdenominational initiative that encourages greater cooperation among Christians and their churches, whether or not the specific aim of that effort is full, visible unity.
The terms ecumenism and ecumenical come from the Greek The ecumenical vision comprises both the search for the visible unity of the Church (Ephesians 4:3) and the "whole inhabited earth" (Matthew ) as the concern of all Christians.
Marginally Generalizing Is Not A Good Thing David Ishii: A Bookseller Rooted in a Place What's In Your Codex, O Theophilus? (Part One) Demythologizing Bultmann Spicing Up the ATA Gimme an R! Let’s focus on home turf, Inter Varsity Christian Fellowship (IVCF). I want to argue that this parachurch organization is nondenominational.If we call it interdenominational, that would seem to mean that several or many denominations—as denominations—cooperate in this campus ministry organization.You need to be able to sign wholeheartedly our doctrinal statement, support our values and mission, etc.Whether this puts you at odds with your own denominational affiliation is between you and your own denomination.