Sex‐ag″e‐na‐ry (?), a. [L. sexagenarius, fr. sexageni sixty each, akin to sexaginta sixty, sex six: cf. sexagénaire. See Six.] Pertaining to, or designating, the number sixty; poceeding by sixties; sixty years old.
Sexagenary arithmetic. See under Sexagesimal. — Sexagenary, orSexagesimal, scale(Math.), a scale of numbers in which the modulus is sixty. It is used in treating the divisions of the circle.