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English definition of “litmus test”

litmus test

noun [C] /ˈlɪt·məs ˌtest/

litmus test noun [C] (CHEMICAL TEST)

chemistry a test of a chemical substance using paper treated with litmus, which tells whether a substance is acid or alkali

litmus test noun [C] (OPINION)

an opinion or action that is thought to show more general opinions or likely future actions: Analysts say the election is a litmus test for democracy in the region.
(Definition of litmus test from the Cambridge Academic Content Dictionary © Cambridge University Press)
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