English Lexicon

Litmus test

/ˈlɪt.məs tɛst/
nounCEFR C1 (Advanced)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A decisively indicative test or critical factor that serves to determine the quality, authenticity, or acceptability of something.

    "The candidate's stance on tax reform served as the litmus test for conservative voters."
  2. 2

    A procedure or measurement that reliably distinguishes between two contrasting options or states.

    "Customer retention serves as a good litmus test for overall product satisfaction."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the chemical litmus paper test used since the 14th century, originating from Old Norse 'lita' meaning to dye or stain, combined with the chemical use of lichen dyes to measure acidity. Over time, the term evolved metaphorically in the late 20th century to describe any single definitive indicator or criterion used to evaluate quality, value, or political inclination.

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