semiquincentennial

1 of 2

noun

semi·quin·cen·ten·ni·al ˌse-mē-ˌkwin-sen-ˈte-nē-əl

ˌse-ˌmī-,

-mi-

plural semiquincentennials

: a 250th anniversary or its celebration

July 4, 2026 marks the nation's semiquincentennial—its 250th birthday since the signing of the Declaration of Independence.—

Kathryn Palmer

Hanover, like some of the dozen or so New Hampshire towns celebrating their semiquincentennial [in 2011], started planning for the celebration back in early 2010.—

Dan Tuohy

semiquincentennial

2 of 2

adjective

: relating to or associated with a 250th anniversary or its celebration

semiquincentennial events/festivities

As the United States approaches its semiquincentennial celebration, Utah drivers will be able to purchase, for a limited time, a license plate with a fresh new design.—

Hayden Madson

Word History

Etymology

Noun

semi- + quincentennial

First Known Use

Noun

1890, in the meaning defined above

Adjective

1955, in the meaning defined above

Time Traveler

The first known use of semiquincentennial was in 1890

See more words from the same year

Browse Nearby Words

semiquietism

semiquincentennial

semiquinone

See all Nearby Words

Cite this Entry

Style

“Semiquincentennial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semiquincentennial. Accessed 20 Jun. 2026.

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