Any lineal or mathematical diagram; an outline, an elaborate and systematic plan of action, an internal representation of the world; an organization of concepts and actions that can be revised by new information about the world, verb_ devise a system or form a scheme for, form intrigues (for) in an underhand manner, transitive verb_ To make a scheme of; to plan; to design; to project; to plot, intransitive verb_ To form a scheme or schemes, To contrive a plan or scheme for; plot, To make plans, especially secret or devious ones