The extension of a church or religion (esp. Roman Catholicism) to all nations or people. Now rare.

Catholic quality, catholicity.

= catholicity, n.

= catholicity, n. 1. rare.

Ecumenical character; universality, catholicity.

spec. of the Church of Rome: The doctrine or faith of that Church, catholicism.

(un-, prefix1 affix 6; cf. unsectarian, adj. n.)

= ecumenicity, n.

the theological system or doctrine of the ecumenical councils.

The doctrine, or quality, of universality (esp. of the Christian church).

The study of the Christian Church as a unity; ecumenic activity.