bar

1. (countable, uncountable, metallurgy) A solid metal object with uniform (round, square, hexagonal, octagonal or rectangular) cross-section; in the US its smallest dimension is ¹⁄₄ inch or greater, a piece of thinner material being called a strip.Examples: "Ancient Sparta used iron bars instead of handy coins in more valuable alloy, to physically discourage the use of money."; "We are expecting a carload of bar tomorrow."countableuncountable

2. (typography) Any of various lines used as punctuation or diacritics, such as the pipe ⟨|⟩, fraction bar (as in 12), and strikethrough (as in Ⱥ), formerly (obsolete) including oblique marks such as the slash.countableuncountable

3. (mathematics) The sign indicating that the characteristic of a logarithm is negative, conventionally placed above the digit(s) to show that it applies to the characteristic only and not to the mantissa.countableuncountable

4. (physics) A similar sign indicating that the charge on a particle is the negative of its usual value (and that consequently the particle is in fact an antiparticle).countableuncountable

5. (by extension, in combination) Premises or a counter serving any type of beverage.Examples: "a coffee bar"; "a juice bar"broadlycountablein-compoundsuncountable

6. (programming, derived from fubar) A metasyntactic variable representing an unspecified entity, often the second in a series, following foo.Examples: "Suppose we have four objects, foo, bar, baz and quux."countableuncountable