i Register
In some senses, atc is marked as UK, US. Watch for register when choosing this word.
noun
Initialism of approval to connect.
Initialism of air traffic controller.
noun
Initialism of air traffic control.
Initialism of automatic train control.
name
Initialism of Air Training Corps (a British youth organisation sponsored by the Ministry of Defence and the Royal Air Force).
Initialism of Air Transport Command (an air transport branch of the US Air Force until June 1 1948, when it was merged with the Naval Air Transport Service to create MATS).
Initialism of Alabang Town Center (a mall in Alabang, Muntinlupa, Philippines).