Definition of unicom:
(n) :
(aviation) An air-ground communication facility operated by a private agency (not air traffic control) to provide advice at uncontrolled aerodromes and airports and to provide non-flight services such as requesting a taxi.
(n) :
Alternative form of unicom. [(aviation) An air-ground communication facility operated by a private agency (not air traffic control) to provide advice at uncontrolled aerodromes and airports and to provide non-flight services such as requesting a taxi.]