Map  —n. 1 a flat representation of the earth's surface, or part of it. B diagram of a route etc. 2 similar representation of the stars, sky, moon, etc. 3 diagram showing the arrangement or components of a thing. —v. (-pp-) 1 represent on a map. 2 math. Associate each element of (a set) with one element of another set.  map out plan in detail. [latin mappa napkin]