- The state of being heathen.
- The priest argued to the king that unless clerics accompanied the colony ship, the colony would soon descend into heathendom and barbarity.
- From one religion's or creed's perspective, the rest of the world that does not follow that creed or religion.
- My aunt considered all of Europe to be heathendom, and refused to visit us in Amsterdam on religious grounds.
- (dated) Specifically, the non-Christian world; territories where Christianity is not the dominant religion.
- The Crusaders meant to wrest Jerusalem from heathendom, but they managed to pillage a number of lands in Christendom along the way.
- (paganism) The worldwide community that follows Heathenry, a modern pagan faith inspired by the pre-Abrahamic religions of Germanic tribes, Anglo-Saxons and Norse peoples.
- (non-Christian world): Christendom
Compound of heathen plus -dom, as it were continuing Old English hǣðendōm, although the Old English word appears to have died out in Middle English, and heathendom was coined anew after Christendom around 1850. OED records a single attestation in the period between 1230 and 1840, a (nonce?) occurrence in J. Law, Proposals and reasons for constituting a council of trade in Scotland (1701, p. 233). Otherwise replaced by heathenism in the 17th and 18th centuries.
Cognate to Old High German heidentuom (German Heidentum), Old Norse heiðindómr (Swedish hedendom).