plural of sexagenary

Containing sixty years. / (now rare) Synonym of sexagenarian: lasting or aged sixty years; sixty-year-old. / (mathematics, astronomy, now rare) Synonym of sexagesimal: base-60.

(mathematics, astronomy, now rare) Synonym of sexagesimal: base-60 numeration. / (now rare) Synonym of sexagenarian: a sixty-year-old.