Definition of crusade

noun (n)

• a series of actions advancing a principle or tending toward a particular end (noun.act)

  Synonym: campaign, cause, drive, effort, movement
  

  source: wordnet30
• any of the more or less continuous military expeditions in the 11th to 13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims (noun.act)

  source: wordnet30
• Any one of the military expeditions undertaken by Christian powers, in the 11th, 12th, and 13th centuries, for the recovery of the Holy Land from the Mohammedans. (noun)

  source: webster1913

verb (v)

• exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for (verb.social)

  Synonym: agitate, campaign, fight, press, push
  

  source: wordnet30
• go on a crusade; fight a holy war (verb.competition)

  source: wordnet30
• To engage in a crusade; to attack in a zealous or hot-headed manner. (verb)

  source: webster1913

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