a representation, usually on a flat surface, as of the features of an area of the earth or a portion of the heavens, showing them in their respective forms, sizes, and relationships according to some convention of representation: a map of Canada.
a maplike delineation, representation, or reflection of anything: The old man's face is a map of time.
Mathematics, function (def 4a).
Slang. the face: Wipe that smile off that ugly map of yours.