Definition of serendipity noun from the Oxford Advanced Learner's Dictionary

 

serendipity

 noun
noun
BrE BrE//ˌserənˈdɪpəti//
 
; NAmE NAmE//ˌserənˈdɪpəti//
 
[uncountable]
 
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the fact of something interesting or pleasant happening by chance Meeting her like that, and there of all places, was true serendipity! Word Origin 1754: coined by Horace Walpole, suggested by The Three Princes of Serendip, the title of a fairy tale in which the heroes “were always making discoveries, by accidents and sagacity, of things they were not in quest of”.
See the Oxford Advanced American Dictionary entry: serendipity