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tricentennial

tri·cen·ten·ni·al

tricentennial

pronunciation:
traI sen te ni l
parts of speech:
adjective, noun
features:
Word Parts
part of speech: adjective
definition 1: lasting for or pertaining to a period of three hundred years; tercentenary.
definition 2: occurring once every three hundred years.
 
part of speech: noun
definition: a three-hundredth anniversary or the celebration accompanying it.