\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.

\Sex`a*ges"i*mal\, n.
A sexagesimal fraction.