Definitions for IDESaɪdz
Random House Webster's College Dictionary
(in the ancient Roman calendar) the 15th day of March, May, July, or October, or the 13th day of the other months.
Category: Horology, Antiquities
* (often cap.) (used with a sing. or pl. v.).
Origin of ides:
1300–50; ME < OF < L īdūs
in the Roman calendar: the 15th of March or May or July or October or the 13th of any other month
the fifteenth day of March, May, July, and October, and the thirteenth day of the other months
The Nuttall Encyclopedia
the name given in the Roman calendar to certain days that divide the month; in March, May, July, and October they fall on the 15th, in the rest on the 13th.