Windfall (noun)

1. A sudden and unexpected large amount of money or gain.
2. Something that falls from a tree, especially fruit that has been blown down by the wind.

Origin:

The word "windfall" originated in the late 16th century from the combination of the words "wind" and "fall" which originally referred to fallen fruit blown down by the wind.

Examples:

1. The company's windfall profit came from the unexpected success of their new product.
2. He was delighted by the windfall of money he received from his great-aunt's estate.
3. The farmer was pleased with the windfall of apples that had fallen from the trees.
4. The small business owner was ecstatic about the windfall of new customers.
5. The windfall of money allowed her to finally take that long-awaited vacation.