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

 

testing

 noun
noun
BrE BrE//ˈtestɪŋ//
 
; NAmE NAmE//ˈtestɪŋ//
 
 
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[uncountable] the activity of testing somebody/something in order to find something out, see if it works, etc. nuclear testing testing and assessment in educationExtra examples All our cosmetics are produced without animal testing. Experts are questioning the value of home cholesterol testing kits. He announced a moratorium on all nuclear testing. More large-scale research and testing of smoke venting systems needs to be undertaken. Police are now using a lot more DNA testing.
See the Oxford Advanced American Dictionary entry: testing