1. (noun) index, index number, indicant, indicator
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: power, exponent, index number, index, indicator, indicant, forefinger, index finger, indication
2. (noun) indicator
a signal for attracting attention
Synonyms: index number, indicant, index
3. (noun) indicator
a device for showing the operating condition of some system
Synonyms: index number, indicant, index
4. (noun) indicator
(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
Synonyms: index number, indicant, index
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