A person or device that plots something together with another plotter, or one who makes plots alongside someone else.
From the prefix co- (meaning 'together') combined with 'plotter' (from Middle English 'plotten', to scheme or chart). The word evolved in the 20th century as scientific and computational work increasingly involved collaborative mapping.
In aviation and navigation, co-plotters were essential team members who helped navigate planes and ships before modern GPS—they literally plotted courses together, and now the term appears in computational contexts where algorithms work as co-plotters to map complex data.
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