Sentence:  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 ‘<WSD>oecumenical</WSD>'. 
Meaning of the word marked with <WSD> tags:  Pertaining to the universal Church, representing the entire Christian world; interdenominational; sometimes by extension, interreligious. (from 16th c.)