What does BAR mean?

noun

1. a room or establishment where alcoholic drinks are served over a counter“he drowned his sorrows in whiskey at the bar”
2. a counter where you can obtain food or drink“he bought a hot dog and a coke at the bar”
3. a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon“there were bars in the windows to prevent escape”
4. musical notation for a repeating pattern of musical beats“the orchestra omitted the last twelve bars of the song”
5. an obstruction (usually metal) placed at the top of a goal“it was an excellent kick but the ball hit the bar”
6. the act of preventing“there was no bar against leaving”
7. (meteorology) a unit of pressure equal to a million dynes per square centimeter“unfortunately some writers have used bar for one dyne per square centimeter”
8. a submerged (or partly submerged) ridge in a river or along a shore“the boat ran aground on a submerged bar in the river”