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n. pl. ser·en·dip·i·ties
1. The faculty of making fortunate discoveries by accident.
2. The fact or occurrence of such discoveries.
3. An instance of making such a discovery.
[From the characters in the Persian fairy tale The Three Princes of Serendip, who made such discoveries, from Persian Sarandīp, Sri Lanka, from Arabic Sarandīb, ultimately from Sanskrit Siṃhaladvīpaḥ : Siṃhalaḥ, Sri Lanka + dvīpaḥ, island; see Dhivehi.]
Word History: We are indebted to the English author Horace Walpole for the word serendipity, which he coined in one of the 3,000 or more letters on which (along with his novel The Castle of Otranto, considered the first Gothic novel) his literary reputation rests. In a letter of January 28, 1754, in which he discusses a certain painting, Walpole mentions a discovery about the significance of a Venetian coat of arms that he has made while looking at random into an old book—a method by which he had apparently made other worthwhile discoveries before: "This discovery I made by a talisman [a procedure achieving results like a charm] ... by which I find everything I want ... wherever I dip for it. This discovery, indeed, is almost of that kind which I call Serendipity, a very expressive word." Walpole formed the word on an old name for Sri Lanka, Serendip. He explained that this name was part of the title of "a silly fairy tale, called The Three Princes of Serendip: as their highnesses travelled, they were always making discoveries, by accidents and sagacity, of things which they were not in quest of...."
in a serendipitous manner; fortunately; by lucky chance