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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

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tricyclic antidepressant
tricyclic antidepressant drug
Tridacna
Tridacna gigas
Tridacnidae
trident
Tridentine
tridymite
tried
tried and true
triennial
triennially
triennium
trier
trifecta
trifid
trifid beggar-ticks
trifid bur marigold
trifle
trifle away
trifler