line

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To fit a covering to the inside surface of.
• transitive verb To cover the inner surface of.
• transitive verb To fill plentifully, as with money or food.
• idiom (line (one's) pockets) To make a profit, especially by illegitimate means.
• noun Mathematics A geometric figure formed by a point moving along a fixed direction and the reverse direction.
• noun A thin continuous mark, as that made by a pen, pencil, or brush applied to a surface.
• noun A similar mark cut or scratched into a surface.
• noun A crease in the skin, especially on the face; a wrinkle.
• noun A real or imaginary mark positioned in relation to fixed points of reference.
• noun A degree or circle of longitude or latitude drawn on a map or globe.
• noun The equator. Used with the.
• noun A border or boundary.
• noun A demarcation.
• noun A contour or an outline.
• noun A mark used to define a shape or represent a contour.
• noun Any of the marks that make up the formal design of a picture.
• noun A cable, rope, string, cord, or wire.
• noun Nautical A rope used aboard a ship.
• noun A fishing line.
• noun A clothesline.
• noun A cord or tape used, as by builders or surveyors, for measuring, leveling, or straightening.
• noun A pipe or system of pipes for conveying a fluid.
• noun An electric-power transmission cable.
• noun A wire or system of wires connecting telephone or telegraph systems.
• noun An open or functioning telephone connection.
• noun A passenger or cargo system of public or private transportation, as by ship, aircraft, or bus, usually over a definite route.
• noun A company owning or managing such a system.
• noun A railway track or system of tracks.
• noun A particular section of a railway network.
• noun A course of progress or movement; a route.
• noun A general method, manner, or course of procedure.
• noun A manner or course of procedure determined by a specified factor.
• noun An official or prescribed policy.
• noun A general concept or model.
• noun The condition of being in proper or aligned position.
• noun A condition of agreement or correspondence.
• noun One's trade, occupation, or field of interest.
• noun Range of competence.
• noun Merchandise or services of a similar or related nature.