[plan.e.tary] adj (1607) 1 a: of, relating to, being, or resembling a planet b: erratic, wandering c: having a motion like that of a planet "~ electrons" d: immense "the scope of this project has reached ~ proportions"
2. a: of, relating to, or belonging to the earth: terrestrial b: global, worldwide
3: having or consisting of an epicyclic train of gear wheels