Definitions
1.NounAn asteroid of any size
2.NounAn asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
3.NounA larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
4.NounAny planetary body, including classical planets and moons: a planetary-mass object
5.NounA dwarf planet