guarantee (
http://definr.com/guarantee)
n 1: a written assurance that some product or service will be
provided or will meet certain specifications [syn:
warrant,
warranty]
2: a pledge that something will happen or that something is
true; "there is no guarantee that they are not lying"
3: a collateral agreement to answer for the debt of another in
case that person defaults [syn:
guaranty]
v 1: give surety or assume responsibility; "I vouch for the
quality of my products" [syn:
vouch]
2: make certain of; "This nest egg will ensure a nice
retirement for us"; "Preparation will guarantee success!"
[syn:
ensure,
insure,
assure,
secure]
3: promise or guarantee [syn:
undertake]
4: stand behind [syn:
warrant]