Definitions
1.NounA fighter or participant in the medieval Crusades."the crusaders of the Middle Ages"
2.NounA person engaged in a crusade.
3.NounAn American, especially a soldier or leader who wages war against Islamist militants.
4.NounA Westerner; a Christian, especially of European descent or a missionary.
5.Noun(either attributively or in the plural) The United States and its Western allies.