invent, contrive, devise, excogitate, formulate, forge -- (come up with (an idea, plan, explanation, theory, or principle) after a mental effort; "excogitate a way to measure the speed of light")
organize, organise, prepare, devise, get up, machinate -- (arrange by systematic planning and united effort; "machinate a plot"; "organize a strike"; "devise a plan to take over the director's office")
devise -- (give by will, especially real property)