Meaning of “litmus test” in the English Dictionary

"litmus test" in British English

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litmus testnoun [ C ]

uk /ˈlɪt.məs ˌtest/ us /ˈlɪt.məs ˌtest/

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.

(Definition of “litmus test” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"litmus test" in American English

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litmus testnoun [ 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)