As a verb, it means to organize people or things so they work well together. As a noun or adjective, it can refer to items of equal importance, or to numbers that show a position on a map or graph.
From Latin *coordinare* 'to set in order', from *co-* 'together' and *ordinare* 'to arrange', related to *ordo* 'order'. It developed both the sense of equal rank and organized arrangement.
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