WordDictionary

Noun:

• insurance law A stipulation or engagement by a party insured, that certain things, relating to the subject of insurance, or affecting the risk, exist, or shall exist, or have been done, or shall be done. These warranties, when expressed, should appear in the policy; but there are certain implied warranties.
• obsolete|legal A covenant real, whereby the granter of an estate of freehold and his heirs were bound to warrant and defend the title, and, in case of eviction by title paramount, to yield other lands of equal value in recompense. This warranty has long since become obsolete, and its place supplied by personal covenants for title. Among these is the covenant of warranty, which runs with the land, and is in the nature of a real covenant.
• legal An engagement or undertaking, expressed or implied, that a certain fact regarding the subject of a contract is, or shall be, as it is expressly implied or promised to be. In sales of goods by persons in possession, there is an implied warranty of title.
• rare Justifying mandate or precept; authority; warrant. Shakespeare
• Security; warrant; guarantee.

Verb:

• To warrant; to guarantee.