ser·en·dip·i·ty [ser-uhn-dip-i-tee]
–noun
1.an aptitude for making desirable discoveries by accident.
2.good fortune; luck: the serendipity of getting the first job she applied for.
[Origin: 1754; Serendip + -ity; Horace Walpole so named a faculty possessed by the heroes of a fairy tale called The Three Princes of Serendip]

—Related forms
ser·en·dip·it·er, ser·en·dip·i·tist, ser·en·dip·per, noun