Guaranty (noun)

1. A promise to take responsibility for the fulfillment of an obligation.
2. A security or pledge given for the fulfillment of an undertaking.

Origin:

From old french guarantir, from garant, from germanic, literally "to ward off".

Examples:

1. The bank required a guaranty before they would loan the money.
2. The manufacturer gave a guaranty that the product would last for a year.
3. A guaranty is a promise to take responsibility for the fulfillment of an obligation.
4. A guaranty can be a security or pledge that is given for the fulfillment of an undertaking.
5. Guaranty can also be used as a verb to mean to give a guarantee or to assure.