1 AIDS-related complex
2 American Red Cross

The file extension that identifies compressed archive files encoded using the Advanced RISC Computing Specification (ARC) format. See also compressed file.

Inverse — used with the trigonometric functions and hyperbolic functions.

ETYM French arc, Latin arcus bow, arc. Related to Arch.
(Homonym: ark).
1. A continuous portion of a circle.
2. Any substance forming the shape of a curve or incomplete circle.

In geometry, a section of a curved line or circle. A circle has three types of arc: a semicircle, which is exactly half of the circle; minor arcs, which are less than the semicircle; and major arcs, which are greater than the semicircle.
An arc of a circle is measured in degrees, according to the angle formed by joining its two ends to the center of that circle. A semicircle is therefore 180ş, whereas a minor arc will always be less than 180ş (acute or obtuse) and a major arc will always be greater than 180ş but less than 360ş (reflex).

To form an arc; to move in the shape of an arc.