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indicator | a device for showing the operating condition of some system | |
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indicator, index, index number, indicant | 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 | |
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indicator | a signal for attracting attention | |
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indicator | [in 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 |