The etymology of the word is uncertain [2. 1880; 6]. Lustrum refers both to the special purification conducted by the censores after the census in Rome and to the five-year interval between two censuses. More generally lustrum refers to any five-year period, in very few exceptional cases to a four-year period [2. 1884], the latter presumably in consequence of merging with the Olympiad after the introduction of the Julian Calendar with its four-year period and the Sullan aboli…
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Mora, Fabio (Messina),
Brill’s New Pauly, Antiquity volumes edited by: Hubert Cancik and , Helmuth Schneider, English Edition by: Christine F. Salazar, Classical Tradition volumes edited by: Manfred Landfester, English Edition by: Francis G. Gentry.
Consulted online on 04 June 2020 <http://dx.doi.org/10.1163/1574-9347_bnp_e712450>