Webster's English Dictionary

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sexagesimal

1. sex.a.ges.i.mal \-'jes-*-m*l\ aj [L sexagesimus sixtieth, irreg. fr. sex 
   six + -ginta (akin to] viginti twenty) - more at VIGESIMAL : of, relating 
   to, or based on the number 60 {~ measurement of an gles ~ system of 
   numeration}
2. sexagesimal n : a sexagesimal fraction