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The bar is a metric (but not SI) unit of pressure exactly equal to 7005100000000000000â 100000 Pa. It is about equal to the atmospheric pressure on Earth at sea level.
bar noun [ C ] (MUSIC) âº US also measure one of the small equal parts into which a piece of music is divided, containing a fixed number of beats: Waltzes have three beats in/to the bar (= in each bar). âº US UK bar line a vertical line that divides one bar from another in a written piece of music.