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English definition of “touchstone”

touchstone

noun [C] uk   /ˈtʌtʃ.stəʊn/ us    /-stoʊn/
an established standard or principle by which something is judged: Until relatively recently, the Japanese car industry was the touchstone of international success.
(Definition of touchstone from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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