NIX, PRESIDENTIALLY is a term that refers to the power of the President of the United States to VETO a bill passed by Congress. The crossword solution for this term is VETO, which is a four-letter word. VETO is derived from the Latin word 'VETO' meaning 'I forbid'. It is the power of the President to reject a bill passed by Congress and prevent it from becoming law. This power is an important part of the checks and balances system in the US government.