INDICATOR

• (noun) a device for showing the operating condition of some system

• (noun) 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

  synonyms : index , index number , indicant

• (noun) a signal for attracting attention

• (noun) (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

WordNet® 3.0, © 2006 by Princeton University.

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