- (n.) A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.
- (n.) The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.
- (n.) An arch.
- (n.) A portion of a curved line; as, the arc of a circle or of an ellipse.
- (v.i.) To form a voltaic arc, as an electrical current in a broken or disconnected circuit.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). arc. Retrieved September 22, 2026, from http://smartdefine.org/arc/definitions/1975494 |
| Chicago | Webster's. 2011. "arc" http://smartdefine.org/arc/definitions/1975494 (accessed September 22, 2026). |
| Harvard | Webster's 2011, arc, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/arc/definitions/1975494>. |
| MLA | Webster's. "arc" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/arc/definitions/1975494> |