Meaning of ARC in English

arc /ɑːk $ ɑːrk/ BrE AmE noun [countable]

[ Date: 1300-1400 ; Language: Old French ; Origin: Latin arcus 'bow, arch, arc' ]

1 . a curved shape or line:

the arc of a rainbow

2 . part of a curved line or a circle:

The Sun moves across the sky in an arc.

3 . a flash of light formed by the flow of electricity between two points

—arc verb [intransitive]

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.