An article dedicated to semantic methods of defining of competitive norms in selected constitutions of Eastern European countries. The principle of legality requires public authorities to act solely on the basis of the applicable law and within the limits defined by them. This means the state body does only what the law expressly permits, and anything else not explicitly stated in the legal provision is prohibited. Therefore, it is very important the legislator speaks deliberately and precisely the legal language. The legislator must avoid a blurred notion and such, that allow for interpretative freedom in normative acts. Taking into account that all legislative activities we perceive to be non-accidental, each legal regulation should have a meaning that makes it impossible to make “arbitrary” decisions.