noun the whole body of christians.
2. christendom ·noun the name received at baptism; or, more generally, any name or appelation.
3. christendom ·noun the profession of faith in christ by baptism; hence, the christian religion, or the adoption of it.
4. christendom ·noun that portion of the world in which christianity prevails, or which is governed under christian institutions, in distinction from heathen or mohammedan lands.