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Adverb: triennially  trI'e-nee-u-lee
  1. Occurring at intervals three years apart

Encyclopedia: Triennially

Nearest

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