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Adverb: triennially
  1. Occurring at intervals three years apart

Nearest

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
trifling