plotter Syllabification: (plot·ter)Pronunciation: /ˈplätər/Translate plotter | into German | into Italian | into Spanish Definition of plotter noun 1someone who secretly makes plans to do something illegal or harmful; a conspirator:the trial of alleged coup plotters 2a piece of equipment that marks out points on a chart:a GPS chart plotterplotter in other Oxford dictionaries Definition of plotter in the British & World English dictionary