Etymology
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crusader (n.)

person engaged in a crusade, 1743, from crusade (n.) + -er (1). Earlier was croisader, from French croisadeur. In Middle English a crusader might be called a pilgrim.

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Definitions of crusader
1
crusader (n.)
a disputant who advocates reform;
Synonyms: reformer / reformist / social reformer / meliorist
2
Crusader (n.)
a warrior who engages in a holy war;
From wordnet.princeton.edu