Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.sacred month, during which the great festivals were held and hostilities suspended, ἱ. Νεμεάς, of the Nemean games, Pi.N.3.2; “ἱ. ἁ Πυθιάς” IG22.1126.44 (Amphict.); “ἐν σπονδαῖς καὶ προσέτι ἱερομηνία” Th.3.56; ἐν σπονδαῖς καὶ ἱερομηνίαις ib.65 (s. v.l.); “ἱ. ἄγειν” D.24.29: in pl., sacrifices offered during the sacred month, IG11(2).154.11 (Delos, iii B.C.); = Lat. supplicatio, App.BC5.130: pl., D.C.39.53 (ἱερο-μήνια , τά, of the Κάρνεια (q.v.), is prob. f.l. in Th.5.54).