A portion of a curved line; as, the arc of a circle or of an ellipse.
- Something shaped like a curve or arch: the vivid arc of a rainbow.
- Mathematics A segment of a circle.
- An electric arc.
- Astronomy The apparent path of a celestial body as it rises above and falls below the horizon.
- To form an arc.
- To move or seem to move in a curved path: the stars that arc across the sky.