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(1)   A device for showing the operating condition of some system
(2)   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
(3)   A signal for attracting attention
(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


< < ; see indicate.


  1. a pointer or index that indicates something
  2. a meter or gauge
  3. the needle or dial on such a meter
  4. any of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction
  5. a plant or animal whose presence is indicative of some specific environment
  6. a measure, such as unemployment rate, which can be used to predict economic trends
  7. a trafficator