Chapter Vesperal to Veto of V by Webster's Dictionary (1913 Edition)

be absolute, as in the case of the Tribunes of the People in ancient Rome, or limited, as in the case of the President of the United States. Called also the veto power.

(b) The exercise of such authority; an act of prohibition or prevention; as, a veto is probable if the bill passes.

(c) A document or message communicating the reasons of the executive for not officially approving a proposed law; — called also veto message. [U. S.]

Veto is not a term employed in the Federal Constitution, but seems to be of popular use only. Abbott.

Veto
(Ve"to), v. t. [imp. & p. p. Vetoed ; p. pr. & vb. n. Vetoing.] To prohibit; to negative; also, to refuse assent to, as a legislative bill, and thus prevent its enactment; as, to veto an appropriation bill.