What term describes the United States' 250th anniversary celebration, officially called America250?

The United States' 250th anniversary celebration is called a semiquincentennial, and America250 is its public branding.

The word semiquincentennial is built from roots associated with half and five hundred, producing the meaning half of five hundred years. In ordinary usage, it means a 250th anniversary. Another technically possible term is bicenquinquagenary, but semiquincentennial is the established name used for the national observance.

The celebration honors the 1776 Declaration of Independence and is scheduled for July 4, 2026. The United States Semiquincentennial Commission coordinates national planning and public engagement.

A bicentennial marks 200 years, while a sesquicentennial marks 150 years. These terms are common sources of confusion because the 1976 bicentennial was the country's previous major national anniversary. America250 therefore refers to the 250-year milestone rather than the earlier 200-year celebration.