Definition of proof of concept noun from the Oxford Advanced Learner's Dictionary

 

proof of concept

 noun
noun
BrE BrE//ˌpruːf əv ˈkɒnsept//
 
; NAmE NAmE//ˌpruːf əv ˈkɑːnsept//
 
[uncountable, countable, usually singular]
 
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evidence that shows that a business proposal, design idea, etc. will work, usually based on an experiment or a pilot project It is important to demonstrate proof of concept. You need to start with a proof of concept to show the process is better and win people over. This project acted as a proof of concept for the electronic filing approach.