—n. 1. a scheme or method of acting, doing, proceeding, making, etc., developed in advance: battle plans. 2. a design or scheme of arrangement: an elaborate plan for seating guests. 3. a specific project or definite purpose: plans for the future. 4. Also called plan view. a drawing made to scale to represent the top view or a horizontal section of a structure or a machine, as a floor layout of a building.
5. a representation of a thing drawn on a plane, as a map or diagram: a plan of the dock area. 6. (in perspective drawing) one of several planes in front of a represented object, and perpendicular to the line between the object and the eye.
7. a formal program for specified benefits, needs, etc.: a pension plan.
—v.t. 1. to arrange a method or scheme beforehand for (any work, enterprise, or proceeding): to plan a new recreation center. 2. to make plans for: to plan one's vacation. 3. to draw or make a diagram or layout of, as a building.
—v.i. to make plans: to plan ahead; to plan for one's retirement.