Charlton T. Lewis, Charles Short, A Latin Dictionary

I.one of the three days in each month from which the other days were reckoned in the Roman calendar, the Ides; it fell upon the fifteenth day of March, May, July, and October; upon the thirteenth day in the remaining months (cf.: “Kalendae, Nonae): res ante idus acta sic est: nam haec idibus mane scripsi,” Cic. Fam. 1, 1, 3: “duas epistulas accepi postridie idus, alteram eo die datam, alteram idibus,” id. Att. 15, 17, 1: haec S. C. perscribuntur a. d. VIII. idus Januarias, Caes. B. C. 1, 5, 4: “omnia licet concurrant: idus Martiae consolantur,” Cic. Att. 14, 4, 2; cf.: “stulta jam iduum Martiarum est consolatio,” id. ib. 15, 4, 2: “si quid vellent, a. d. idus Apr. reverterentur,” Caes. B. G. 1, 7 fin.: “iduum Septembrium dies,” Tac. A. 2, 32: “postero iduum dierum,” id. H. 1, 26.—The ides were sacred to Jupiter, Varr. ap. Macr. S. 1, 14; cf. “idulis.—Interest was paid on the ides: fenerator Alphius, Jam jam futurus rusticus, Omnem redegit idibus pecuniam, Quaerit Kalendis ponere,” Hor. Epod. 2, 69: “diem pecuniae Idus Novembres esse,” Cic. Att. 10, 5, 3: “jam vel sibi habeat nummos, modo numeret Idibus,” id. ib. 14, 20, 2: “praetermitto ruinas fortunarum tuarum, quas omnes impendere tibi proximis Idibus senties,” id. Cat. 1, 6, 14.—The payment of school-money at the ides is referred to in: “(pueri) Ibant octonis referentes idibus aera,” Hor. S. 1, 6, 75; v. Orell. ed h. 1.