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3. Observance that falls on the anniversary of Einstein's birth

Alternative clues for the word piday

• Math nerds' annual 3/14 celebration
• When MIT mails acceptance letters
• Annual math-related observance celebrated, appropriately, on 3/14: 2 wds
• March 14, to math fans
• March 14, mathematically
• March 14, to math lovers
• A constant celebration?
• March 14, to mathematicians
• March 14 celebration