‖n. [ NL., fr. L. septuagesimus the seventieth, fr. septuaginta seventy. ] (Eccl.) The third Sunday before Lent; -- so called because it is about seventy days before Easter. [ 1913 Webster ]
a. Consisting of seventy days, years, etc.; reckoned by seventies. [ 1913 Webster ]
Our abridged and septuagesimal age. Sir T. Browne. [ 1913 Webster ]