Definition of selcal:
(n) :
(aviation) A system for alerting a specific aircraft that a radio station on the ground wishes to communicate with them, via transmitting an aircraft-specific sequence of audio tones over the aircraft's company radio frequency to an automatic decoder on board the aircraft.
(n) :
(aviation, countable) An alert sent via this system.
(v) :
(aviation, transitive) To send a SELCAL alert to (an aircraft).
(n) :
Alternative form of SELCAL. [(aviation) A system for alerting a specific aircraft that a radio station on the ground wishes to communicate with them, via transmitting an aircraft-specific sequence of audio tones over the aircraft's company radio frequency to an automatic decoder on board the aircraft.]
(v) :
Alternative form of SELCAL. [(aviation, transitive) To send a SELCAL alert to (an aircraft).]