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telephone a device used to send sound or some other signal over long distances by wire or radio waves. A telephone has a part for speaking into and a part for listening. [1/3 definitions]
warning a signal or notice of a possibly dangerous situation. [1/3 definitions]
wave a motion or signal made by moving the hand up and down or back and forth. [2/10 definitions]
whistle to signal or give a command by such a sound or sounds. [2/9 definitions]
word a signal or command. [1/6 definitions]