n A solid, more or less rigid object with a uniform cross-section smaller than its length.
n (countable|uncountable|metallurgy) A solid metal object with uniform (round, square, hexagonal, octagonal or rectangular) cross-section; in the US its smallest dimension is .25 inch or greater, a piece of thinner material being called a strip.
n (legal|"the Bar") Short for the Bar exam, the legal licensing exam.
n (legal|"the Bar") A collective term for lawyers or the legal profession; specifically applied to barristers in some countries but including all lawyers in others.
n (music) A vertical line across a musical staff dividing written music into sections, typically of equal durational value.