noun
: a remote supervisory control system in which code signals in the form of electric impulses are sent out by a dispatcher and return signals are received through the medium of colored lights
noun
: a remote supervisory control system in which code signals in the form of electric impulses are sent out by a dispatcher and return signals are received through the medium of colored lights
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012