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Happening every three years. quotations examples
They were constantly summoned to a triennial festival : and the most approved songs delivered at this assembly were ordered to be preserved in the custody of the king's historian or antiquary
1774-1781, Thomas Warton, History of English Poetry
Lasting for three years. quotations examples
Triennial Subsidies
September 13 1621, James Howell. letter to Sir William Saint John
plural triennials
A third anniversary. examples
A plant that requires three years to complete its life-cycle. examples