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In the ancient Roman calendar, a day falling roughly in the middle of each month (the 15th day of March, May, July, and October, and the 13th of other months) from which other dates were calculated.

beware the Ides of March according to Plutarch, a warning given by a soothsayer to Julius Caesar that he would be in great danger on the Ides of March; Caesar was assassinated on that day.

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