Biannual vs. Triannual
Biannualadjective
Occurring twice a year; semiannual.
Biannualadjective
(proscribed) Occurring once every two years; biennial.
Biannualnoun
Something occurring twice each year.
Biannualadjective
Occurring twice a year; half-yearly; semiannual.
Biannualadjective
occurring or payable twice each year
Triannualadjective
Happening three times each year.
