arc
Definitions
A part of a curve, especially a portion of the circumference of a circle.
A luminous electrical discharge between two electrodes or terminals.
A continuous progression or development in a narrative or character's journey.
Examples
The rainbow formed a perfect arc across the sky after the storm.
The gymnast moved in a graceful arc as she performed her routine on the balance beam.
The welder watched the bright blue arc flicker as the metal began to fuse together.