biennium

Noun

biennium (plural bienniums or biennia)

1. A period of two years, particularly for purposes involving intercalation or fiscal calculations.
   • The Greeks being taught by their Oracles, that their accuſtomed Sacrifices were to be offered κατά τρία, which they underſtood as if their Year were to be regulated by the Sun, and their Days and Months were to be adjuſted by the motion of the Moon; were always ſolicitous, how by certain Periods...1704, Giles Strauchius [i.e., Aegidius Strauch II], “Of the Lunar Cycle”, in Richard Sault, transl., Breviarium Chronologicum. Or A Treatise Describing the Terms and Most Celebrated Characters...
   • No commentator on Herodotus has succeeded in explaining the curious mistake whereby the solar year is made to average 375 days. That Herodotus knew the true solar year was not 375, but more nearly 365 days, is clear from book ii. ch. iv. It is also clear that he must be right as to the fact that...1858, Herodotus; George Rawlinson and Henry Rawlinson, translators and editors, “The First Book, Entitled Clio”, in The History of Herodotus. A New English Version, Edited with Copious Notes and...