Source : Webster's Revised Unabridged Dictionary (1913)

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

Sexagenary \Sex*ag"e*na*ry\, a. [L. sexagenarius, fr. sexageni
   sixty each, akin to sexaginta sixty, sex six: cf.
   sexag['e]naire. 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.

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.

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.

Source : WordNet®

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