[ ses-kwi-sen-ten-ee-uh l ]
/ ˌsɛs kwɪ sɛnˈtɛn i əl /
pertaining to or marking the completion of a period of 150 years.
a 150th anniversary or its celebration.
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
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|DAILY BEAST
British Dictionary definitions for sesquicentennial
/ (ˌsɛskwɪsɛnˈtɛnɪəl) /
of or relating to a period of 150 years
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