- The religion of Christians; the system of doctrines
and precepts taught by Christ. - Practical conformity of one's inward and outward life
to the spirit of the Christian religion - The body of Christian believers.
Meaning of 'christianity' (Princeton's WordNet)
1 . christianity
[ n]
Meaning (1): - the collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia)
Example in sentence:
for a thousand years the Roman Catholic Church was the principal church of Christendom