noun

• (astronomy) That part of a circle which a heavenly body appears to pass through as it moves above and below the horizon.
• (geometry) A continuous part of the circumference of a circle (circular arc) or of another curve.
• (electrics) A flow of current across an insulating medium; especially a hot, luminous discharge either between two electrodes or as lightning.
• (narratology) Ellipsis of story arc.
  "For while most comics have designated entry points into the story in the form of arcs, Homestuck is one elaborate, self-referencing inside joke collapsed inside its own funhouse mirror reflection."

verb

• (ambitransitive) To move following a curved path.
  "A warring bloodhunter detected it and skillfully arced his sword through its spinal column before it could return to follow through with its attack."
• (transitive) To shape into an arc; to hold in the form of an arc.
  "His mother, her eyes raised to heaven, hands arked before her, moving, made real for John that patience, that endurance, that long suffering, which he had read in the Bible and found so hard to image."
• (intransitive) To form an electrical arc.

noun

• (publishing) Acronym of advance reader's copy, a copy of a book given to a reviewer free in advance for review purposes.
  "“One of them came up to me in a signing line and asked for a blurb,” says Jen. “Can you believe it? Title I’ve never heard of, from some small press I’ve never heard of, and she comes up to me with a bound ARC, beaming, like of course I’m going to say yes.”"
• (pathology) Initialism of AIDS-related complex.
• (programming, uncountable) Acronym of automatic reference counting.

name

• (nautical, military) The Colombian Navy (Armada de la República de Colombia).