The story
- Old English · inherited fromcristendōm
- Middle English · inherited fromcristendom
- English todayChristendom
From Middle English cristendom, cristendome, from Old English cristendōm, equivalent to Christen + -dom.
First known use, by meaning
- from 14th c. The Christian world; Christ's Church on Earth.
- from 9th c. The state of being a (devout) Christian; Christian belief or faith.
Etymology from Wiktionary, CC BY-SA 4.0.