trienniallyadv.
/trʌɪˈɛnɪəli/, U.S. /traɪˈɛniəli/ Every three years; once in three years.
ΘΚΠ
the world > time > period > year > [adverb] > every specific number of years
triennially1689
quinquennially1727
septennially1729
biennially1775
quadrennially1785
sexennially1824
millennially1851
octennially1854
decennially1874
1689 in 6th Coll. Papers rel. Pres. Juncture 25 The Parliament to be chosen Triennially, and to meet Annually.
1727 N. Bailey Universal Etymol. Eng. Dict. II Triennially.
1806 W. Taylor in Ann. Rev. 4 714 It appears that the tithe ought to be levied triennially.
1881 Chambers's Jrnl. No. 914. 419/1 The gorgeous festival given..triennially at the Crystal Palace.
This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2022).
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