"Veto authority" refers to the power or right to reject or block a decision or action made by others. It allows someone to say "no" and prevent something from happening, even if others are in favor of it. Full definition
Rome's wealthiest and most prominent citizens were ineligible to hold the office of plebeian tribune, an office with extensive power within the Roman constitution: tribunes wielded veto authority over most policy measures; initiated and led discussions over legislation in Rome's popular assemblies; and they publicly tried wealthy and prominent citizens before the people for political crimes. (blog.politics.ox.ac.uk)
A source told Capital Tonight that one of the proposals being floated in the negotiations over Senate leadership would be to allow IDC Leader Jeff Klein to retain the power of co-president of the chamber, along with veto authority and a seat at the budget negotiation table. (nystateofpolitics.com)
Adopting the model of God as «persuader,» Burkle concludes that the human being is delegated a possible veto authority. (religion-online.org)