guarantee

a written assurance that some product or service will be provided or will meet certain specifications (noun.communication)

Sinonim: warrant, warrantee, warranty

Sumber: wordnet30

an unconditional commitment that something will happen or that something is true (noun.communication)

There is no guarantee that they are not lying

Sumber: wordnet30

a collateral agreement to answer for the debt of another in case that person defaults (noun.possession)

Sinonim: guaranty

Sumber: wordnet30

In law and common usage: A promise to answer for the payment of some debt, or the performance of some duty, in case of the failure of another person, who is, in the first instance, liable to such payment or performance; an engagement which secures or insures another against a contingency; a warranty; a security. Same as Guaranty. (noun)

Sumber: webster1913

give surety or assume responsibility (verb.communication)

Sinonim: vouch

Sumber: wordnet30

make certain of (verb.communication)

Preparation will guarantee success!

Sinonim: assure, ensure, insure, secure

Sumber: wordnet30

promise to do or accomplish (verb.communication)

Guarantee to free the prisoners

Sinonim: undertake

Sumber: wordnet30

stand behind and guarantee the quality, accuracy, or condition of (verb.communication)

Sinonim: warrant

Sumber: wordnet30

In law and common usage: to undertake or engage for the payment of (a debt) or the performance of (a duty) by another person; to undertake to secure (a possession, right, claim, etc.) to another against a specified contingency, or at all events; to give a guarantee concerning; to engage, assure, or secure as a thing that may be depended on; to warrant; as, to guarantee the execution of a treaty. (verb)

Sumber: webster1913