something that can show how a particular situation is developing, or how peoples opinions on a particular matter are changing:
Barometer
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Noun - Actually a devise for measuring pressure. Is commonly used by adults esp. teachers/coaches as any kind of obscure measurement. A PSAT, for example, acts as a barometer for how well you will do in the actual SAT.
Barometer meaning & definition 1 of Barometer.
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An instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.
Barometer meaning & definition 2 of Barometer.
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a device that measures air pressure and shows when the weather is likely to change
Barometer meaning & definition 3 of Barometer.
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