In the Roman calendar, a specific day in the middle of each month (the 13th in most months, the 15th in March, May, July, and October).
From Latin 'idus,' of uncertain origin but possibly connected to an Etruscan word. The Romans used this calendar system for religious and administrative purposes.
The 'Ides of March' became immortal because Julius Caesar was assassinated on that date in 44 BCE—Shakespeare immortalized the warning 'Beware the Ides of March' in his play.
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