Dictionary.net

Practice. A warranty is a contract real, annexed to lands and tenements, whereby a man is bound to defend such lands and tenements from another person; and in case of eviction by title paramount, to give him lands of equal value.

Voucher to warranty is the calling of such warrantor into court by the party warranted, (when tenant in a real action brought for recovery of such lands,) to defend the suit for him; Co. Litt. 101, b; Com. Dig. Voucher, A 1; Booth, 43 2 Saund. 32, n. 1; and the time of such voucher is after the deman-dant has counted. It lies in most real and mixed actions, but not in personal. Where the voucher has been made and allowed by the court, the vouchee either voluntarily appears, or there issues a judicial writ (called a summons ad warrantizandum,) commanding the sheriff to summon him. Where he, either voluntar-ily or in obedience to this writ, appears and offers to warrant the land to the tenant, it is called entering into the warranty; after which he is considered as tenant in the action, in the place of the original tenant. The deman-dant then counts against him de novo, the vouchee pleads to the new count, and the cause proceeds to issue. 2 Inst. 241 a; 2 Saund. 32, n. 1; Booth, 46.

Voucher of warranty is, in the present rarity of real actions, unknown in practice. Steph. Plead. 85.