sesquicentennial

American

[ses-kwi-sen-ten-ee-uhl] / ˌsɛs kwɪ sɛnˈtɛn i əl /

adjective

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

noun

a 150th anniversary or its celebration.

sesquicentennial British

/ ˌsɛskwɪsɛnˈtɛnɪəl /

adjective

of or relating to a period of 150 years

"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

noun

a period or cycle of 150 years
a 150th anniversary or its celebration

"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

Other Word Forms

Derived Forms

sesquicentennially

adverb

Etymology

Origin of sesquicentennial

An Americanism dating back to 1875–80; sesqui- + centennial

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023