sesquicentennial

[ ses-kwi-sen-ten-ee-uh l ]
/ ˌsɛs kwɪ sɛnˈtɛn i əl /
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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 forms

ses·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

British Dictionary definitions for sesquicentennial

sesquicentennial

/ (ˌsɛskwɪsɛnˈtɛnɪəl) /

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 Forms

sesquicentennially, 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