sesquicentennial

[ses-kwi-sen-ten-ee-uh l]

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

Examples from the Web for sesquicentennial

Contemporary Examples of sesquicentennial

Many of us have tired of the blizzard of histories marking the sesquicentennial of the first years of the American Civil War.
Atlanta’s Fall Foretold The End Of Civil War Bloodshed
Marc Wortman
September 1, 2014

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.