sesquicentennial

[ ses-kwi-sen-ten-ee-uhl ]

adjective

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

noun

1. a 150th anniversary or its celebration.

sesquicentennial

/ ˌsɛskwɪsɛnˈtɛnɪəl /

adjective

1. of or relating to a period of 150 years

noun

1. a period or cycle of 150 years
2. a 150th anniversary or its celebration

Derived Forms

• ˌsesquicenˈtennially, adverb

Other Words From

• sesqui·cen·tenni·al·ly adverb

Word History and Origins

Origin of sesquicentennial¹

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

Example Sentences

Cedar Point had to postpone its sesquicentennial celebration till its 151st birthday, and Hersheypark has finally put the finishing touches on the 23-acre expansion of Hershey’s Chocolatetown, which opened last July.

From Washington Post

Many of us have tired of the blizzard of histories marking the sesquicentennial of the first years of the American Civil War.

From The Daily Beast

The ongoing sesquicentennial celebration has only redoubled that flood of new material and public fascination with the war.

From The Daily Beast

It was on the engine at the time of the Carlisle sesquicentennial but disappeared by the time of the St. Louis exposition.

From Project Gutenberg