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(also **sexagesimal fraction**)

1Relating to or reckoning by sixtieths.

*‘a decimal system like ours or a sexagesimal system like the Babylonian’*

2Relating to the number sixty.

*‘In ancient Babylon a sexagesimal system, that is a base of 60, was in use.’**‘The Babylonian scale of enumeration is known as the sexagesimal system.’**‘Writing developed and counting was based on a sexagesimal system, that is to say base 60.’**‘No other culture of the ancient world developed a sexagesimal number system, although non-Sumerian groups adopted the Sumerian script to represent their languages and used their numerical system.’**‘The most important of these was the sexagesimal place value system, widely associated with signs for the numbers 1, 10, 60, 600, and 3600.’*

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.

*‘The first deals with integers, the second with proper common fractions, the third with improper fractions, and finally the fourth with sexagesimals.’**‘More fractions can therefore be represented as finite sexagesimal fractions than can as finite decimal fractions.’**‘In fact there are fascinating glimpses of the Babylonians coming to terms with the fact that division by 7 would lead to an infinite sexagesimal fraction.’**‘The necessary background mathematical tools are then introduced such as the arithmetical operations on sexagesimal fractions and the trigonometric functions.’**‘It gave tables of sines with entries calculated to three sexagesimal places for each half degree of the argument.’*

Late 17th century from Latin sexagesimus ‘sixtieth’ + -al.

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