1. A lucky accident or stroke of good fortune.
* Example sentence: "Winning the lottery was a complete fluke; he never even buys tickets."
2. A flatfish with a diamond-shaped body and a flattened appearance.
* Example sentence: "The fisherman caught a large fluke off the coast of Massachusetts."
3. A mistake or error, especially in a piece of machinery or equipment.
* Example sentence: "The power outage was caused by a fluke in the electrical system."
It's important to consider the context to determine the correct meaning of "fluke."