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1.
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.
a signal for attracting attention
3.
a device for showing the operating condition of some system
4.
(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
5.
a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn
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