Crusade/kruːˈseɪd/ Definition 1 of 3Pro Tip 1/3Modern Movements Usually indicates a social or political movement focused on reform or change. The environmental crusade has gained momentum in recent years. Pro Tip 2/3Passionate Effort Implies a dedicated and passionate effort, often by an individual or group. He's leading a personal crusade to improve local public transport. Pro Tip 3/3Positive Change Generally used for movements perceived as beneficial or ethical. The community started a crusade to support the homeless.