Plain English Meaning
ARINC is a company that sets the common rules for how aircraft electronic equipment is built and connected, so that radios, instruments, and computers from different makers can all work together on the same aircraft.
Full Definition
A company that provides communication and data services for the aviation industry, and which publishes the technical standards used for avionics equipment design and installation. ARINC standards define how avionics units connect, exchange data, and physically fit into an aircraft, allowing equipment from different manufacturers to work together.
Context Anchor
Seen in avionics manuals, wiring diagrams, equipment specifications, and maintenance instructions for aircraft electronic systems.
Derivation
Aeronautical Radio Incorporated was formed in 1929 by U.S. airlines to manage shared radio communication services. The name reflects its original purpose -- a single organisation handling aeronautical radio for the industry. Today it covers more than radio, but the name stuck.