indicator

  • noun 1 a thing that indicates a state or level. 2 a gauge or meter of a specified kind. 3 a flashing light on a vehicle to show that it is about to change lanes or turn. 4 Brit. an information board or screen in a railway station, airport, etc. 5 Chemistry a compound which changes colour at a specific pH value or in the presence of a particular substance, and can be used to monitor a chemical change.

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