guarantee: Meaning and Definition of

guar•an•tee

1. a promise or assurance, esp. one in writing, that something is of specified quality, content, benefit, etc., or that it will perform satisfactorily for a given length of time: a money-back guarantee.
2. guaranty (defs. 1, 2).
3. something that assures a particular outcome or condition: Wealth is no guarantee of happiness.
4. a person who gives a guarantee or guaranty; guarantor.
5. a person to whom a guarantee is made.

1. to secure, as by giving or taking security.
2. to make oneself answerable for (something) on behalf of someone else who is primarily responsible: to guarantee the fulfillment of a contract.
3. to undertake to ensure for another, as rights or possessions.
4. to serve as a warrant or guaranty for.
5. to engage to protect or indemnify: to guarantee a person against loss.
6. to engage (to do something).
7. to promise (usually fol. by a clause as object): I guarantee that I'll be there.