serendipity

1. The phenomenon of making an unplanned, fortunate discovery through a combination of unexpected circumstances and insightful recognition. (countable, uncountable)
2. An unsought, unintended or unexpected, but fortunate, discovery or learning experience that occurs by accident. (countable, uncountable)
3. The occurrence and development of events by chance in a happy or beneficial way. (countable, uncountable)

Plural serendipities