calculus
noun/ˈkælkjələs/
/ˈkælkjələs/
[uncountable]- the type of mathematics that deals with rates of change, for example in the slope of a curve or the speed of a falling objectTopics Maths and measurementc2Word Originmid 17th cent.: from Latin, literally ‘small pebble (as used on an abacus)’.
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calculus