1 definition by mw23224

Top Definition
a day celebrated by math geeks across the world on march 14th
Nerd #1: Hey, did you know that the first 50 digits of pi are 3.141 592 6535 8979 323 84 6264 3383 2795 0288 4197 169 3993 751?

Nerd #2: Shut up, I know the first 1,000. Try it next pi day.
by mw23224 March 14, 2007
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