Triannual
Part of speech: adjective
Definition: Happening three times each year.
Triennial
Part of speech: adjective
Definition: Happening every three years.Lasting for three years.
Part of speech: noun
Definition: A third anniversary.
Triannual as an adjective is happening three times each year. while Triennial as an adjective is happening every three years.
Part of speech: adjective
Definition: Happening three times each year.
Part of speech: adjective
Definition: Happening every three years.Lasting for three years.
Part of speech: noun
Definition: A third anniversary.
We hope you now know whether to use Triannual or Triennial in your sentence.