Definition of subtraction noun from the Oxford Advanced Learner's Dictionary

 

subtraction

 noun
noun
BrE BrE//səbˈtrækʃn//
 
; NAmE NAmE//səbˈtrækʃn//
 
[uncountable, countable]
 
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the process of taking a number or amount away from another number or amount The children are tested on basic addition and subtraction. compare addition (1)