March 4, 2009
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ante diem iv kalendas martias Festival of Mars (day 4) 51 A.D. — the future emperor Nero is given the title princeps iuventutis ca 254 A.D. — martyrdom of Gaius
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au fait (Wordsmith) temerity (Dictionary.com) oligopsony (Merriam-Webster) polyonymosity (Worthless Word for the Day)