Triennially
adjective
1.
occurring every three years.
2.
lasting three years.
noun
3.
a third anniversary.
4.
something that appears or occurs every three years.
5.
a period of three years; triennium.
adjective
1.
relating to, lasting for, or occurring every three years
noun
2.
a third anniversary
3.
a triennial period, thing, or occurrence
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