sex·a·ges·i·mal /-ˈʤɛsəməl/
 (a.)六十的,以六十為單位的,六十進法的六十分數


 sexagesimal
 六十進制的


 Sex·a·ges·i·mal a.  Pertaining to, or founded on, the number sixty.
 Sexagesimal fractions or Sexagesimal numbers Arith. & Alg., those fractions whose denominators are some power of sixty; as, called also astronomical fractions, because formerly there were no others used in astronomical calculations.
 Sexagesimal arithmetic, or Sexagenary arithmetic, the method of computing by the sexagenary scale, or by sixties.
 Sexagesimal scale Math., the sexagenary scale.

From: Webster's Revised Unabridged Dictionary (1913)

 Sex·a·ges·i·mal, n. A sexagesimal fraction.

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From: WordNet (r) 2.0

 sexagesimal
      adj : of or relating to or reckoning in sixtieths; "the
            sexagesimal divisions of hours and degrees"