serendipity - sehr-en-DIP-ih-tee - luck, happenstance, kismet, chance

Example: "Though it's pure serendipity, ever since 1886 as many as 40,000 people gather on February 2 to see if a rodent, Punxutawney Phil, pops out of his hole in that Pennsylvania town; if he sees his shadow (as he did this morning), it heralds six more weeks of winter; if not, then an early spring is predicted.