Definition of blind test noun from the Oxford Advanced Learner's Dictionary

 

blind test

 noun
noun
BrE
 
; NAmE
 
 
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a way of deciding which product out of a number of competing products is the best or most popular, or how a new product compares with others. People are asked to try the different products and to say which ones they prefer, but they are not told the names of the products. In blind tests, consumers chose our cola over more established brands.
See the Oxford Advanced American Dictionary entry: blind test