WordReference Random House Learner's Dictionary of American English © 2014
guar•an•tee /ˌgærənˈti/USA pronunciation  n., pl.  -tees,v.,  -teed, -tee•ing.

n. [countable]
  1. an assurance, esp. one in writing, that something is of specified quality, content, benefit, etc., or will please the customer or perform satisfactorily for a given length of time.
  2. guaranty (defs. 1, 2).guaranty d="1"guaranty
  3. something that makes sure a particular outcome or condition will come to pass:Wealth is not a guarantee of happiness.

  1. [+ object] to offer a guarantee for:The company guarantees its machines for ten years.
  2. [+ object] to make oneself answerable for (something) on behalf of someone else; vouch for:I guarantee his behavior.
  3. [+ object] to protect against damage or loss:This insurance guarantees a person against property loss.
  4. to assure that a stated outcome is certain: [+ object + to + verb]That clown show is guaranteed to bring a smile to your face.[+ (that) clause]I guarantee that I'll be there.

Collins Concise English Dictionary © HarperCollins Publishers::

guarantee /ˌɡærənˈtiː/ n
  1. a formal assurance, esp in writing, that a product, service, etc, will meet certain standards or specifications
  2. a promise, esp a collateral agreement, to answer for the debt, default, or miscarriage of another
  3. a person, company, etc, to whom a guarantee is made
  4. a person, company, etc, who gives a guarantee
  5. a person who acts as a guarantor
  6. something that makes a specified condition or outcome certain
  7. a variant spelling of guaranty
vb ( -tees, -teeing, -teed)(mainly tr)
  1. (also tr) to take responsibility for (someone else's debts, obligations, etc)
  2. to serve as a guarantee for
  3. to secure or furnish security for: a small deposit will guarantee any dress
  4. usually followed by from or against: to undertake to protect or keep secure, as against injury, loss, etc
  5. to ensure: good planning will guarantee success
  6. (may take a clause as object or an infinitive) to promise or make certain
Etymology: 17th Century: perhaps from Spanish garante or French garant, of Germanic origin; compare warrant

'guarantee' also found in these entries:

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