Source : Webster's Revised Unabridged Dictionary (1913)

Sexagesimal \Sex`a*ges"i*mal\, a. [Cf. F. sexag['e]simal.]
   Pertaining to, or founded on, the number sixty.

   {Sexagesimal fractions} or {numbers} (Arith. & Alg.), those
      fractions whose denominators are some power of sixty; as,
      1/60, 1/3600, 1/216000; -- called also {astronomical
      fractions}, because formerly there were no others used in
      astronomical calculations.

   {Sexagesimal}, or {Sexagenary}, {arithmetic}, the method of
      computing by the sexagenary scale, or by sixties.

   {Sexagesimal scale} (Math.), the sexagenary scale.