- The definition of a barometer is a device that measures the pressure of the atmosphere as an aid to predicting weather.
A device that shows the pressure of the air is an example of a barometer.
- an instrument for measuring atmospheric pressure, esp. an aneroid barometer or an evacuated and graduated glass tube () in which a column of mercury rises or falls as the pressure of the atmosphere increases or decreases: barometers are used in forecasting changes in the weather or finding height above sea level
- anything that reflects or indicates change: the stock market is a barometer of business
Origin of barometerbaro- + -meter
- An instrument for measuring atmospheric pressure, used especially in weather forecasting.
- Something that registers or responds to fluctuations; an indicator: Opinion polls serve as a barometer of the public mood.
- bar′o·met′ric , bar′o·met′ri·cal
From Ancient Greek βάρος (baros, “weight”) + -meter.
barometer - Investment & Finance Definition
In the financial markets, an important economic statistic or stock index that indicates market direction or sentiment. Some of the more frequently cited barometers are the NASDAQ Composite Index, the Dow Jones Industrial Average, the U.S. unemployment rate, the rate of inflation, and the consumer price index.