1. A number or ratio (a value on a scale of measurement) derived from a series of observed facts;
    Can reveal relative changes as a function of time (synset 106652323)
  2. A signal for attracting attention (synset 107277247)
  3. A device for showing the operating condition of some system (synset 103573297)
  4. (chemistry) a substance that changes color to indicate the presence of some ion or substance;
    Can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction (synset 114941359)

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