idus

Etymology
According to Macrobius (Macr. Sat. 1, 15. § 17) from an verb meaning to divide, which he cites with Latin flexion as īduāre.

Noun

 * 1) The ides; in the Roman calendar the fifteenth day of March, May, July, October, and the thirteenth day of the other months. Eight days after the nones.

Etymology
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Noun

 * 1)  ides