It means the nullity of any decision, for reasons of illegality, injustice or fraudulence, also because they did not have due process or not to have followed the necessary and required procedures. It means rejecting the validity of an assertion, idea or argument by reason or proof. Rebut, disprove, contradict, censor.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
