Ides (calendar), a day in the Roman calendar that fell roughly in the middle of the month. In March, May, July, August and October it was the 15th day of the month; in other months it was the 13th
Ides of March, a day in the Roman calendar that corresponded to March 15; it was marked by several religious observances and became notorious as the date of the assassination of Julius Caesar in 44 BC
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