biennary

From Latin biennium (“a two-year period”) + -ary (“forming adjectives”)

biennary (not comparable)

1. (uncommon) Synonym of biennial: of or concerning a two-year period; lasting or occurring every two years.
   • 1878, W.S.B. Woolhouse & al., "Calendar" in the Encyclopædia Britannica, 9th ed., Vol. IV, p. 668:

     The first expedient adopted to reconcile the lunar and solar years seems to have been the addition of a month of thirty days to every second year. Two lunar years would thus contain 25 months, or 738 days, while two solar years, of 365¼ days each, contain 730½ days. The difference of 7½ days was still too great to escape observation; it was accordingly proposed by Cleostratus of Tenedos, who flourished shortly after the time of Thales, to omit the biennary intercalation every eighth year.