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Dictionary definition for: Indicator

1. (n) 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

2. (n) a signal for attracting attention

3. (n) a device for showing the operating condition of some system

4. (n) (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

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