American English

Definition of touchstone noun from the Oxford Advanced American Dictionary

 

touchstone

 noun
noun
NAmE//ˈtʌtʃstoʊn//
 
[usually singular] touchstone (of/for something) (formal)
 
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something that provides a standard against which other things are compared and/or judged the touchstone for quality
See the Oxford Advanced Learner's Dictionary entry: touchstone