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adieu an act of departing or signal of departure. [1/2 definitions]
all clear the signal that an air raid or disaster drill is over.
AM a system of varying a radio signal's amplitude so as to impose the signal on a carrier wave; amplitude modulation. [1/2 definitions]
bandwidth the range of radio frequencies required to transmit a certain type of signal.
beacon a signal of light that guides or gives warning, often located in an elevated position. [2/7 definitions]
beam an electronic communications signal. [2/8 definitions]
beckon to signal to come, esp. with a gesture. [1/2 definitions]
beep a short, usu. high-pitched warning signal. [3 definitions]
beeper a device that emits a beeping sound when it receives a radio signal, usu. used for paging those who carry it.
blinker a flashing light, esp. one used on a vehicle to indicate the direction of a turn, or one used as a traffic signal. [1/2 definitions]
buzz to signal with a device that buzzes. [1/9 definitions]
buzzer any of numerous mechanical or electrical devices that signal by buzzing.
carrier the electromagnetic wave that is modulated to transmit a signal; carrier wave. [1/6 definitions]
cease-fire an order or signal to stop firing, as in war. [1/2 definitions]
cell phone a mobile telephone that operates using radio signals and therefore requires no wires. A cell phone is part of a system composed of many low-power radio transmitters located in "cells" across a region and will receive a radio signal from whichever transmitter in the system is closest.
cellular phone a mobile telephone that operates using radio signals and therefore requires no wires. A cellular phone is part of a system composed of many low-power radio transmitters located in "cells" across a region and will receive a radio signal from whichever transmitter in the system is closest.
converter an electronic device that changes or adds frequencies of a television or radio signal. [1/5 definitions]
countersign a password or secret signal used to identify an ally. [2/4 definitions]
cue1 in theater, anything done or said that is a signal for speech or action on the stage. [3 definitions]
demodulate in telecommunications, to derive the original signal from (a modulated carrier signal); detect.
denote to be a mark or signal of; indicate. [1/3 definitions]