Definition of dwarf planet in English English dictionary
As recognized by the International Astronomical Union, any body which has achieved hydrostatic equilibrium (is reasonably spherical), orbits the sun, and has not "cleared its neighbourhood" (as opposed to a planet)
A dwarf planet is a celestial body within the Solar System that satisfies the following four conditions: 1.) is in orbit around the Sun. 2.] has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (near-spherical) shape. 3.] has not cleared the neighbourhood around its orbit. 4.] is not a satellite