1 (Crusade) each of a series of medieval military expeditions made by Europeans to recover the Holy Land from the Muslims in the 11th, 12th, and 13th centuries:the fanaticism engendered by the Crusadesin 1204 the armies of the Fourth Crusade sacked Constantinople
a war instigated for alleged religious ends:the Albigensian crusades
2a vigorous campaign for political, social, or religious change:a crusade against crime
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Universal
lead or take part in a vigorous campaign for social, political, or religious change:a crusading stance on poverty