Bicenquinquagenary is an alternative name for the United States Semiquincentennial, built from roots meaning two, hundred, and fifty.
The more familiar term semiquincentennial describes a 250th anniversary through the roots “semi,” meaning half, and “quincentennial,” relating to 500 years. Because the word is uncommon, several alternative labels have appeared in discussions of the 2026 anniversary.
Bicenquinquagenary uses a different construction: “bi” refers to two, “cent” refers to hundred, and “quinquagen” refers to fifty. Together, those elements describe 250 years. The term is precise but much less common in public usage than semiquincentennial.
Other labels can cause confusion. “Sesquicentennial” means a 150th anniversary, while “sestercentennial” is another term associated with 250 years. “Quarter millennium” describes the same span in plain English, but it is not the root-based word asked for here.