Definition - What does Legislative Veto mean?
A legislative veto is a veto that is made by either the Senate or the House of Representatives, which cancels a particular action or regulation made by an administrative agency.
If a legislative veto occurs, then the particular decision that was made by an agency of the executive branch will be legally null and void.
Justipedia explains Legislative Veto
Legislative veto is a check on the power of the executive branch. It prevents agencies of the executive branch from making their own rules and regulations without the consent of the legislative branch. This is significant considering the fact that it is the responsibility of the legislative branch to create laws, and to make sure that the ones in existence are sound and in harmony with the Constitution.
In order for a legislative veto to occur, a certain number of votes will have to happen in favor of it.