ides Meaning, Definition & Usage

  1. noun in the Roman calendar: the 15th of March or May or July or October or the 13th of any other month

WordNet

Ides noun plural
Etymology
L. idus: cf. F. ides.
Definitions
  1. (Anc. Rom. Calendar) The fifteenth day of March, May, July, and October, and the thirteenth day of the other months.
    The ides of March remember. Shak.
    ✍ Eight days in each month often pass by this name, but only one strictly receives it, the others being called respectively the day before the ides, and so on, backward, to the eightth from the ides.

Webster 1913