- (n.) A portion of a curved line; as, the arc of a circle or of an ellipse.
- (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.) An arch.
- (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.
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Definition for: RCA
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- (n.) A small vehicle moved on wheels; usually, one having but two wheels and drawn by one horse; a cart.
- (n.) A vehicle adapted to the rails of a railroad.
- (n.) A chariot of war or of triumph; a vehicle of splendor, dignity, or solemnity.
- (n.) The stars also called Charles's Wain, the Great Bear, or the Dipper.
- (n.) The cage of a lift or elevator.
- (n.) The basket, box, or cage suspended from a balloon to contain passengers, ballast, etc.
- (n.) A floating perforated box for living fish.