semiquincentennial

From semi- +‎ quincentennial.

• IPA^(key): /ˌsɛmiˌkwɪnsɛnˈtɛniəl/

semiquincentennial (plural semiquincentennials)

1. A 250th anniversary.

   Synonym: sestercentennial

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

   • 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:

     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.