Etymology
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sesquicentennial (adj.)

"pertaining to a century and a half," 1875, from sesqui- + centennial (adj.). First in a notice of a "Sesqui-Centennial gathering" of descendants of Isaac and Ann Jackson, who settled in London Grove, Chester County, Pa., in 1725. As a noun, from 1880, first in reference to Baltimore's, probably short for sesquicentennial celebration, etc. 

Resolution to close the City Hall offices during the Sesqui-Centennial after 12 M on the 12th 13th 11th 15th and 16th of October [Journal of Proceedings of the First Branch City Council of Baltimore, Tuesday, Oct. 5, 1880]

The alternative noun sesquicentenary or sesqui-centenary is attested from 1896 (in reference to Princeton's).

updated on June 06, 2022

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Definitions of sesquicentennial from WordNet

sesquicentennial (n.)
the 150th anniversary (or the celebration of it);
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near sesquicentennial

serving

servitude

servo

sesame

sesqui-

sesquicentennial

sesquipedalian

sessile

session

sestet

sestina