Definition of decimal noun from the Oxford Advanced American Dictionary

 

decimal

 noun
noun
NAmE//ˈdɛsəml//
 
(also decimal fraction)
 
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a fraction (= a number less than one) that is shown as a dot or point followed by the number of tenths, hundredths, etc. The decimal 0.61 stands for 61 hundredths. see also repeating decimal
See the Oxford Advanced Learner's Dictionary entry: decimal