sexagesimal

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sex·a·ges·i·mal / ˌseksəˈjesəməl/ • adj. 1. of, relating to, or reckoning by sixtieths.2. of or relating to the number sixty.• n. (also sexagesimal fraction) a fraction based on sixtieths (i.e., with a denominator equal to a power of sixty), as in the divisions of the degree and hour.DERIVATIVES: sex·a·ges·i·mal·ly adv.