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From The Collaborative International Dictionary of English v.0.48:
Windage \Wind"age\, n. [From Wind air in motion.] [1913 Webster] 1. (Gun.) The difference between the diameter of the bore of a gun and that of the shot fired from it. [1913 Webster] 2. The sudden compression of the air caused by a projectile in passing close to another body. [1913 Webster]