'Christendom' definitions:

Definition of 'Christendom'

noun

The collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia); "for a thousand years the Roman Catholic Church was the principal church of Christendom" [syn: Christendom, Christianity]

Definition of 'Christendom'

From: GCIDE

Christendom \Chris"ten*dom\, n. [AS. cristend[=o]m; cristen a Christian + -dom.]
1. The profession of faith in Christ by baptism; hence, the Christian religion, or the adoption of it. [Obs.] --Shak. [1913 Webster]
2. The name received at baptism; or, more generally, any name or appelation. [Obs.] [1913 Webster]
Pretty, fond, adoptious christendoms. --Shak. [1913 Webster]
3. That portion of the world in which Christianity prevails, or which is governed under Christian institutions, in distinction from heathen or Mohammedan lands. [1913 Webster]
The Arian doctrine which then divided Christendom. --Milton [1913 Webster]
A wide and still widening Christendom. --Coleridge. [1913 Webster]
4. The whole body of Christians. --Hooker. [1913 Webster]