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Indicator

ˈɪndɪkeɪtə

Indicator definitions
noun
indicator indicators
  1. a thing that indicates the state or level of something

    "car ownership is frequently used as an indicator of affluence"

    • an animal or plant species that can be used to infer conditions in a particular habitat

      "the raccoon is a poor choice as an indicator of riparian habitat"

  2. a gauge or meter of a specified kind

    "a speed indicator"

    meter measuring instrument measuring device measure gauge dial display scale index
    • a flashing light or (formerly) other device on a vehicle to show that it is about to change lanes or turn

      "an indicator light"

    • a board or screen in a railway station, airport, etc. giving current information

      "the indicator board"

  3. a compound that changes colour at a specific pH value or in the presence of a particular substance, and can be used to monitor acidity, alkalinity, or the progress of a reaction

    "the remaining alkali is titrated against standard acid using phenolphthalein as indicator"