1. The middle of the month in the Roman calendar, specifically the 15th day of March, May, July, and October, and the 13th day of the other months.

Examples

• The Ides of March is famously associated with the assassination of Julius Caesar.
• In ancient Rome, the Ides were significant for various religious observances.
• Many people mark the Ides of March as a day of caution.
• The calendar indicated that the Ides of May were approaching.
• On the Ides of July, the festival of the Ludi Apollinares was celebrated.