An outline, boundary or border, usually of curved shape.

A line on a map or chart delineating those points which have the same altitude or other plotted quantity: a contour line or isopleth.

(linguistics) a speech sound which behaves as a single segment, but which makes an internal transition from one quality, place, or manner to another.

(figurative) A general description giving the most important points.

(transitive) To form a more or less curved boundary or border upon.

(transitive) To mark with contour lines.

(intransitive) To practise the makeup technique of contouring.