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.

guaranty ( defs. 1, 2 ) .

something that assures a particular outcome or condition

Wealth is no guarantee of happiness.

a person who gives a guarantee or guaranty; guarantor.

a person to whom a guarantee is made.

to secure, as by giving or taking security.

to make oneself answerable for (something) on behalf of someone else who is primarily responsible

to guarantee the fulfillment of a contract.

to undertake to ensure for another, as rights or possessions.

to serve as a warrant or guaranty for.

to engage to protect or indemnify

to guarantee a person against loss.

to engage (to do something).

to promise (usually fol. by a clause as object)

I guarantee that I'll be there.

verb

break

noun

agreement , assurance , attestation , bail , bargain , bond , certainty , certificate , certification , charter , collateral , contract , covenant , deposit , earnest , gage , guaranty , insurance , lock , oath , pawn , pipe , recognizance , security , sure thing * , surety , testament , token , undertaking , vow , warrant , warranty , word , word of honornotes:guarantee is from old french garant \'a warrant , \' while warranty is from old north french warantie , derived from warant \'a warrant.\' both garant and warant came from frankish (the west germanic language spoken in the 400s and 500s in the region of ancient gaul that became france) , represented by old high german weren \'to confirm , warrant.\' guarantee is a general term for a representation regarding a good\'s quality and performance - and warranty is the legal term for the document; the person to whom it is issued is the warrantee with the issuer being the warrantor , engagement , pledge , plight , solemn word , word of honor , palladium , promise

verb

affirm , angel , answer for , assure , attest , aver , back , bankroll , be surety for , bind oneself , certify , confirm , cosign , endorse , ensure , evidence , evince , get behind * , give bond , grubstake , guaranty , insure , juice * , maintain , make bail , make certain , make sure , mortgage , pick up the check , pick up the tab , protect , prove , reassure , secure , sign for , stake , stand behind * , stand up for * , support , swear , testify , vouch for , wager , warrant , witnessnotes:guarantee is from old french garant \'a warrant , \' while warranty is from old north french warantie , derived from warant \'a warrant.\' both garant and warant came from frankish (the west germanic language spoken in the 400s and 500s in the region of ancient gaul that became france) , represented by old high german weren \'to confirm , warrant.\' guarantee is a general term for a representation regarding a good\'s quality and performance - and warranty is the legal term for the document; the person to whom it is issued is the warrantee with the issuer being the warrantor , agreement , assurance , bail , bond , certificate , contract , covenant , earnest , insurance , pledge , promise , seal , security , stipulate , surety , token , undertaking , underwrite , vouch , vouchsafe , warranty , word