Etymology
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windage (n.)

1710, "allowance of space between the projectile and the diameter of the tube of a firearm," from wind (n.1) + -age. Meaning "allowance for wind deflection" is from 1867.

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Definitions of windage

windage (n.)
the retarding force of air friction on a moving object;
windage (n.)
the space between the projectile of a smoothbore gun and the surface of the bore of the gun;
windage (n.)
exposure to the wind (as the exposed part of a vessel's hull which is responsible for wind resistance);
Synonyms: wind exposure
windage (n.)
the deflection of a projectile resulting from the effects of wind;
Synonyms: wind deflection
From wordnet.princeton.edu