The Christian world or realm; all Christian nations and peoples collectively, or the domain of Christian influence.
Compound of Christ + -dom (suffix meaning realm or authority, as in kingdom or dukedom). Formed in Middle English to describe the unified Christian world as a political and spiritual entity.
During the Middle Ages, 'Christendom' and 'Christdom' referred to Christian-controlled territories as a unified bloc against Islamic powers—it was a geopolitical identity before modern nations even existed.
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