triennial

Meanings

1. 1
   adj

   occurring every three years or lasting for three years

   The association holds a triennial election for its governing council.

2. 2
   noun

   an event, exhibition, or publication that occurs every three years

   The museum invited artists from twenty countries to its next triennial.

From Latin triennium, 'a three-year period,' formed from tres, 'three,' + annus, 'year,' with the adjectival suffix -al. Unlike tricentennial, triennial does not mean a three-hundredth anniversary.

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