Nundinium was a Latin word derived from the word nundinum, which referred to the cycle of days observed by the Romans. During the Roman Empire, nundinium came to mean the duration of a single consulship among several in a calendar year. Sources Historia Augusta, Vita Alexander, 28, 43; Vita Tacitus, 9 Theodor Mommsen, Abriss des römischen Staatsrechts (Leipzig 1893), Vol 2, p. 84; Vol. 3, p. 375 Government of the Roman Empire