What does “semiquincentennial” mean in the context of America250?

In the context of America250, “semiquincentennial” means a 250th anniversary.

The word combines Latin- and Greek-derived elements associated with “half,” “five,” and “hundred.” In practical use, it identifies the anniversary of an event that occurred two and a half centuries earlier. America250 commemorates the 250th anniversary of the adoption of the United States Declaration of Independence in 1776.

The term is less familiar than “bicentennial,” which means a 200th anniversary. Other labels sometimes used for the 2026 observance include “sestercentennial,” “quarter millennium,” and “bisesquicentennial,” although “semiquincentennial” is the formal name used for the national commemoration.

America250 is therefore linked specifically to 1776 and 2026: adding 250 years to the Declaration’s adoption year produces the anniversary year. The central national observance falls on Independence Day, July 4, 2026.