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1a thing, especially a trend or fact, that indicates the state or level of something:car ownership is frequently used as an indicator of affluence 2a device providing specific information on the state or condition of something, in particular. [usually with modifier] a gauge or meter of a specified kind:a speed indicator 3 Chemistry a compound that changes color 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. 4 (also indicator species) an animal or plant species that can be used to infer conditions in a particular habitat.
at the end.