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sesquicentennial

ses·qui·cen·ten·ni·al

sesquicentennial

pronunciation:
ses kwih sen te ni l
parts of speech:
adjective, noun
features:
Word Parts
part of speech: adjective
definition: of or pertaining to a time span of 150 years.
 
part of speech: noun
definition: a 15th anniversary or its celebration.
derivation: sesquicentennially (adv.)