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Adverb:
triennially
trI'e-nee-u-lee
Occurring
every
three years or
lasting
for three years
"The
art
exhibition
is
held
triennially"
Encyclopedia:
Triennially
Tridacna gigas
Tridacnidae
trident
Trident
Tridentine
triduum
tridymite
tried
tried and true
triennial
triennially
triennium
trier
trifecta
triffid
trifid
trifid beggar-ticks
trifid bur marigold
trifle
trifle away
trifler