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The faculty of making fortunate discoveries by accident.

Modified meaning: of or pertaining to being "cool" or "sweet"

"Oh, man, it's totally serendipitous."
by teah4 April 23, 2008
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An expression used by individuals to sound confident and smart when explaining why something is successful, but in reality they have no fucking clue. The individual often believes they are the only person to ever have used this word in a sentence, and will often wear a shit-eating grin upon saying it.
Twitter is so successful because it was built to leverage serendipitous social connections. :)
by serendipitous definer November 13, 2009
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3
another word for "cool" "awesome" or "amazing". used in Fineus (not sure how to spell it...) and Pherb.
hey that shirt is totally serendipitous.

megan, you're so serendipitous!
by hey kid sup May 14, 2009
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