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Adjective: triennial  trI'e-nee-ul
  1. Occurring every third year or lasting 3 years
Noun: triennial  trI'e-nee-ul
  1. The 300th anniversary (or the celebration of it)
    - tercentennial, tercentenary

Derived forms: triennials

See also: periodic, periodical

Type of: anniversary, day of remembrance

Encyclopedia: Triennial