octennial

Founding-era definition · Webster's 1828 American Dictionary

OCTEN'NIAL, adjective [Latin octo, eight, and annus, year.] 1. Happening every eighth year. 2. Lasting eight years.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI

More founding-era words: liberty · virtue · republic · justice · providence · commerce · militia · arms · prudence · establishment · religion · usurpation · tyranny · citizen · unalienable · sovereign