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English definition of “litmus test”

litmus test

noun [C ]    
a test to find out if a substance is acid or alkaline [usually singular] someone's decision or opinion about something that suggests what they think about a wider range of related things: The president's policy on abortion is regarded as a litmus test of his views on women's rights .Signs, signals and symbolsSpecific signs and symbols
(Definition of litmus test noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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