the english word 'veto' is a direct borrowing from latin, where it is the first-person singular present active indicative of the verb 'vetare', meaning 'i forbid'. this specific form was used in the proceedings of the roman tribunes, who could block legislative actions by declaring 'veto'. the term entered english in the 17th century, particularly in the context of the constitutional powers of the english sovereign. it retains the core sense of a prohibitive authority, now institutionalized in political systems where a single entity can reject a legislative act.

this word is a direct loanword from latin. it is not productively formed from smaller english morphemes and therefore is not segmented.