Sexagenary

Part of speech: noun (n.)

1. Something composed of sixty parts or divisions.

2. A sexagenarian. Sir W. Scott.

Part of speech: adjective (a.)

Pertaining to, or designating, the number sixty; poceeding by sixties; sixty years old. Sexagenary arithmetic. See under Sexagesimal. -- Sexagenary, or Sexagesimal, scale (Math.), a scale of numbers in which the modulus is sixty. It is used in treating the divisions of the circle.