Meaning of “crusade” in the English Dictionary

"crusade" in British English

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(Definition of “crusade” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"crusade" in American English

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crusadenoun [ C ]

us /kruˈseɪd/

a long and determined attempt to achieve something you strongly believe in:

She’s involved in the crusade for racial equality.
The Crusades world history

The Crusades were a series of wars in the 11th, 12th, and 13th centuries fought between Christians from Europe and Muslims in the region around the eastern Mediterranean Sea.

crusade
verb [ I ] us /kruˈseɪd/

He crusaded tirelessly for civil rights.
crusader
noun [ C ] us /kruˈseɪ·dər/

a crusader for social justice

(Definition of “crusade” from the Cambridge Academic Content Dictionary © Cambridge University Press)