ser·en·dip·i·ty
ˌserənˈdipədē/
noun
the occurrence and development of events by chance in a happy or beneficial way.
“a fortunate stroke of serendipity”
synonyms: (happy) chance, (happy) accident, fluke; luck, good luck, good fortune, fortuity, providence; happy coincidence
“the consequence of serendipity is sometimes a brilliant discovery”