What has been described a motor vehicle for one statutory purpose may not suit the purpose of another. In its customary meaning, a motor vehicle has the essential characteristics of a self-propelled contrivance designed for the carriage of persons or things. By definition, railway devices have been excluded.
Process in which one parent cell divides to form two single cells? That process is called Mitosis in regular cells and Meiosis in sex cells or asexual reproduction. Edit
 When a cell splits and becomes two, certain processes occur within  the nucleus first. One of these processes involves the splitting of  the chromosomes. This process is called Mitosis and there are four  distinct stages.