See also: tri-annual

English edit

Etymology edit

tri- +‎ annual

Adjective edit

triannual (not comparable)

  1. Happening three times each year.

Usage notes edit

  • To avoid confusion between "triennial," once every three years, and "triannual," three times in one year, it is often better to substitute a less ambiguous phrase such as "three times a year" or "every four months."

Translations edit

See also edit

  • triennial (every three years) which is sometimes confused with triannual (usually every four months).
  • biennial (every two years).
  • biannual (twice a year).