biennia

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...