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In mathematics, an arc is a part of a circle between two points (also called a circle segment). A minute of arc is an angle measure, being 1/60 of a degree. A second of arc is 1/60 of a minute of arc.

In graph theory, an arc is a synonym for an edge.

Arc is also a name for a dialect of the Lisp programming language.

See also: Arc lamp, voltaic arc.