veto
1. ve.to \'ve-t-(.)o-\ n or vetoes [L, I forbid, fr. vetare to forbid] pl 1: an authoritative prohibition : INTERDICTION 2a: a power of one department or branch of a government to forbid or prohib it finally or provisionally the carrying out of projects attempted by another department; esp : a power vested in a chief executive to prevent permanently or temporarily the enactment of measures passed by a legislature 2b1: the exercise of such authority 2b2: a message communicating the reasons of an executive and esp. the presi dent of the U.S. for vetoing a proposed law 2. veto \-.o-(-*)r\ vt : to refuse to admit or approve : PROHIBIT; also : to ref use assent to (a legislative bill) so as to prevent enactment or cause reconsideration - ve.to.er n
 Webster's English Dictionary