The Collaborative International Dictionary
Sexagenary
Sexagenary \Sex*ag"e*na*ry\, a. [L. sexagenarius, fr. sexageni sixty each, akin to sexaginta sixty, sex six: cf. sexag['e]naire. See Six.] Pertaining to, or designating, the number sixty; poceeding by sixties; sixty years old.
Sexagenary arithmetic. See under Sexagesimal.
Sexagenary scale, or Sexagesimal scale (Math.), a scale of numbers in which the modulus is sixty. It is used in treating the divisions of the circle.
Sexagenary
Sexagenary \Sex*ag"e*na*ry\, n.
Something composed of sixty parts or divisions.
A sexagenarian.
--Sir W. Scott.
Wiktionary
sexagenary
a. 1 of or pertaining to the number sixty; composed of, or proceeding by sixties 2 sexagenarian n. 1 sexagesimal 2 sexagenarian