The word "ecumenism" (also oecumenism, œcumenism) (IPA: /ɛkˈjuːmɛˌnɪzəm/) is derived from the Greek oikoumene, which means "the inhabited world". In its broadest meaning ecumenism is the religious initiative towards world-wide unity. A more limited goal of ecumenism is the promotion of co-operation and improved understanding between distinct religious groups or denominations within the same religion.