Definition of Guarantee

Babylon English Dictionary
vouch for; give a guarantee; give a warranty; promise, assure
security; warranty; pledge; assurance
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Guarantee Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The person to whom a guaranty is made; -- the correlative of guarantor.
  
(n.)
One who binds himself to see an undertaking of another performed; a guarantor.
  
(n.)
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 avents; 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.
  
(n.)
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.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

guarantee
\guar`an*tee"\ (?), n.; pl. guarantees (#). [for guaranty, prob. influenced by words like assignee, lessee, etc. see guaranty, and cf. warrantee.]
1. 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. his interest seemed to be a guarantee for his zeal.
2. one who binds himself to see an undertaking of another performed; a guarantor.
note: guarantor is the correct form in this sense.
3. (law) the person to whom a guaranty is made; -- the correlative of guarantor.

JM Welsh <=> English Dictionary
Gwaranred = n. a guarantee
Gwaranredu = v. to guarantee
Australian Slang
on the verge of death
WordNet 2.0

Noun
1. a written assurance that some product or service will be provided or will meet certain specifications
(synonym) warrant, warrantee, warranty
(hypernym) assurance, pledge
(hyponym) security, surety
(derivation) warrant
2. a pledge that something will happen or that something is true; "there is no guarantee that they are not lying"
(hypernym) assurance, pledge
(hyponym) safety net
(derivation) warrant
3. a collateral agreement to answer for the debt of another in case that person defaults
(synonym) guaranty
(hypernym) collateral

Verb
1. give surety or assume responsibility; "I vouch for the quality of my products"
(synonym) vouch
(hypernym) pledge, plight
(hyponym) bail
(verb-group) ensure, insure, assure, secure
(derivation) warrant, warrantee, warranty
2. make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
(synonym) ensure, insure, assure, secure
(hyponym) doom
(verb-group) vouch
3. promise to do or accomplish; "guarantee to free the prisoners"
(synonym) undertake
(hypernym) promise, assure
(hyponym) underwrite, subvention, subvent
4. stand behind and guarantee the quality, accuracy, or condition of; "The dealer warrants all the cars he sells"; "I warrant this information"
(synonym) warrant
(hypernym) back, endorse, indorse, plump for, plunk for, support
(hyponym) cover, insure, underwrite
Guarantee Definition from Business & Finance Dictionaries & Glossaries
Campbell R. Harvey's Hypertextual Finance Glossary
The assumption of responsibility for payment of a debt or performance of some obligation if the liable party fails to perform to expectations.
Copyright © 2000, Campbell R. Harvey. All Rights Reserved.
MONASH Marketing Dictionary
a written assurance by the manufacturer that a product will be replaced or repaired to the customer's satisfaction if it is found to be defective or does not perform as intended. See Warranty.
2004 (c) Copyright & Reprint Courtesy of the Dept. of Marketing, Faculty of Business and Economics, Monash University; edited by Mr. Don Bradmore.
Guarantee Definition from Science & Technology Dictionaries & Glossaries
Dictionary of Automotive Terms
A promise by the manufacturer to fix or replace a specific part if it does not last for a specific time period or distance.
Guarantee Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A surety, surety bond or guaranty, in finance, is a promise by one party to assume responsibility for the debt obligation of a borrower if that borrower defaults. The person or company that provides this promise, is also known as a surety or guarantor.

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Guarantee Definition from Law Dictionaries & Glossaries
The 'Lectric Law Library
In law, a contract under which one person agrees to pay a debt or perform a duty if the other person who is bound to pay the debt or perform the duty fails to do so.
Courtesy of the 'Lectric Law Library.