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Related to ides: Ides of March, IADES
pl.n. (used with a sing. or pl. verb)
The 15th day of March, May, July, or October or the 13th day of the other months in the ancient Roman calendar.
[Middle English, from Old French, from Latin Īdūs, probably of Etruscan origin.]
[C15: from Old French, from Latin īdūs (plural), of uncertain origin]
n. (often cap.) (used with a sing. or pl. v.)
(in the ancient Roman calendar) the 15th day of March, May, July, or October, or the 13th day of the other months.
[1300–50; Middle English < Old French < Latin īdūs]