sesquicentennial

[ses-kwi-sen-ten-ee-uh l]
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adjective

pertaining to or marking the completion of a period of 150 years.

noun

a 150th anniversary or its celebration.

Origin of sesquicentennial

An Americanism dating back to 1875–80; sesqui- + centennial
Related formsses·qui·cen·ten·ni·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sesquicentennial

sesquicentennial

adjective

of or relating to a period of 150 years

noun

a period or cycle of 150 years
a 150th anniversary or its celebration
Derived Formssesquicentennially, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sesquicentennial
adj.

"pertaining to a century and a half," 1878, from sesqui- + centennial. As a noun from 1880; first recorded reference is to Baltimore's.

Online Etymology Dictionary, © 2010 Douglas Harper