Definition of Leymann: "the psicoterror or Mobbing in the labor life tolerates a hostile and lacking communication of ètica that és administered of systematic way by one or pocs individual, principalment against an only individual, that, as a result of this, is sent to a situation of solitude and prolonged defenselessness, with accions of fustigamiento frequent and persistent (at least once for week) and throughout a prolonged period (at least during six months)".

Definition of Iñaki Piñuel: "I mistreat verbal and continued conductual and frequents in the time, of almenos six months and that take place every week; a final objectivo of fustigar, oppressing, to reduce, to intimidate, and to break down the psychological resistance of the victim so that it leaves the place of work by means of the loss, the resignation or originating dismissal; and an obligation of the victim to go to a work place where they know that they are going to be fustigados ".

Definition of the U.E: "negative Behavior between superior or inferior companions or hierarchic, because of the qual the affected one is object of harassment and attacks systematic during long time, of direct or indirect way, from one or more persones, with the objectivo i/o effect to do vacio to him" (14-5-01).

The National Institute of Security and Hygiene in the Work defines "mobbing" like an exercise of extreme violence, articulated of systematic form and prolonganda on a person in its place of work.