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From The Collaborative International Dictionary of English v.0.48:
Windfall \Wind"fall`\, n. 1. Anything blown down or off by the wind, as fruit from a tree, or the tree itself, or a portion of a forest prostrated by a violent wind, etc. "They became a windfall upon the sudden." --Bacon. [1913 Webster] 2. An unexpected legacy, or other gain. [1913 Webster] He had a mighty windfall out of doubt. --B. Jonson. [1913 Webster] [1913 Webster]