A person who is sixty years old.

a. [L. sexagenarius, fr. sexageni sixty each, akin to sexaginta sixty, sex six: cf. sexagenaire. See Six.] 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.

Sex•ag´e•na•ry, n. 1. Something composed of sixty parts or divisions. 2. A sexagenarian. Sir W. Scott.

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