semiquincentennial

1. not comparableOf or relating to a 250th anniversary.

   She […] now serves as co-chair of the committee planning the observation and celebration of the university's semiquincentennial (250th) anniversary.

   2014 May, John Bishop, “In the Wind …”, in Stephen Schnurr, editor, The Diapason, number 5 (number 1254 overall), Arlington Heights, Ill.: Scranton Gillette Communications, →ISSN, →OCLC, page 6, columns 2–3

   4 more examples

   [Bath, N.C. SemiQuincentennial Committee] Program for celebrating the 250th anniversary of the Incorporation of Bath, North Carolina, on March 8, 1705, October 1, 2, 3, 4, 1955. [Bath, 1955] 32 p.

   1958, Mary Lindsay Thornton, compiler, A Bibliography of North Carolina 1589–1956, Chapel Hill, N.C.: University of North Carolina Press, →OCLC, page 26

   As part of the semi-quincentennial celebrations, the chapter commemorated the 250th anniversary of the Boston Tea Party on October 26 at the Rose Hill Church of God Church.

   2023 November 22, “Martin’s Station SAR [Sons of the American Revolution] observes Boston Tea Party anniversary”, in Powell Valley News, volume 47, Pennington Gap, Va.: Powell Valley Print. Co., →OCLC, page 9, column 1

   Parades, pageants, flag-waving and fireworks. These, plus a good dose of history, will all play a role in the United States Semiquincentennial celebrations leading up to and on July 4, 2026 – the 250th anniversary of the adoption of the Declaration of Independence.

   2025 July 2, Chloe Veltman, “America has a Major Birthday Coming up – here’s what to Expect for the Big 2-5-0”, in NPR, archived from the original on 09 Jun 2026

   NATIONAL MUSEUM OF AMERICAN HISTORY "In Pursuit of Life, Liberty, and Happiness," through December. This semiquincentennial celebration features 250 objects – including the desk used by Thomas Jefferson to draft the Declaration of Independence – spread over 250,000 square feet.

   2026 June 12, “On exhibit: Museums”, in The Washington Post (Weekend section), Washington, D.C.: The Washington Post Company, →ISSN, →OCLC, page 8, column 4

   Synonyms: sestercentenary

plural semiquincentennials

1. A 250th anniversary.

   The year 2026 will mark the semiquincentennial of the founding of the United States.

   5 more examples

   "How old is the town anyway?" / "Well," said Brian, "while America was celebrating her bicentennial in 1976, Bath [in North Carolina] had already celebrated it[s] semiquincentennial in 1955." / "What's that?" asked Michael. / "It was Bath's 250th birthday."

   1979, Carole Marsh, “A Clue Comes Ashore”, in The Mystery of Blackbeard the Pirate (Carole Marsh Mysteries; 3), new edition, Peachtree, Ga.: Gallopade International/Carole Marsh Books, published 2003, →ISBN, page 43

   But in case you feel that you have been unduly diffident about your topic, or that you ought to be saying a little more about commemorating centennials or, rather, semiquincentennials, you might perhaps think about starting, or even ending, your first draft with a remark made by a character in an English novel that was published exactly one hundred years after [Johann Kaspar] Lavater's visit to England: […]

   2005, “Johann Kaspar Lavater 1741–1801”, in Russel Whitaker, editor, Nineteenth-century Literature Criticism: Criticism of the Works of Novelists, Philosophers, and Other Creative Writers who Died between 1800 and 1899, from the First Published Critical Appraisals to Current Evaluations, volume 142, Farmington Hills, Mich.: Thomson Gale, →ISBN, →ISSN, page 70, column 1

   [W]hile he was reading a book on Orange County's history, he discovered that the big anniversary would be coming right up. "Son of a gun!" he said. "What?" Louey and Dan asked in unison. They'd been lying on the living room floor, reading comics. "We're in our semi-quincentennial." […] "Semi-quincentennial," Abe repeated. "Our 250th anniversary."

   2009, Genie Abrams, “Thank God, I Make a Living”, in Louey Levy’s Greatest Catch, [Schodack, N.Y.]: Troy Book Makers, →ISBN, page 123

   Even now, 250 years later, as we celebrate America's semiquincentennial with barbecues and parades and fireworks, we look back on that struggle, that war, and that document [the Declaration of Independence] as a glorious success that resulted in our unique and ongoing experiment.

   2026, Daniel S. Levy, “The Birth of an Idea: How the Events of 1776 and the Concept of Freedom Spread around the World”, in Samuel Jacobs, editor, Time: 1776, commemorative edition, New York, N.Y.: People Inc., →ISSN, →OCLC, page 7, column 2

   For many Americans, the semiquincentennial is less a celebration than a reckoning.

   2026 July 1, Fabiola Cineas, “‘The next 250 years belong to all of us’: Seven activists on rebuilding the US”, in Katharine Viner, editor, The Guardian, London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 02 Jul 2026

   Synonyms: sestercentennial, bisesquicentennial, bicenquinquagenary