Etymology
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guarantee (n.)

1670s, "person that gives security," altered (perhaps via Spanish garante or confusion with legalese ending -ee), from earlier garrant "warrant that the title to a property is true" (early 15c.), from Old French garant "defender, protector; warranty; pledge; justifying evidence," from a Germanic source, from Proto-Germanic *war- "to warn, guard, protect," from PIE root *wer- (4) "to cover." For form evolution, see gu-. Sense of the "pledge" itself (which is properly a guaranty) developed 18c.

guarantee (v.)

1791, "to be surety for," from guarantee (n.). Garanten in this sense is from early 15c. Related: Guaranteed; guaranteeing.

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Definitions of guarantee
1
guarantee (v.)
give surety or assume responsibility;
Synonyms: vouch
guarantee (v.)
make certain of;
Preparation will guarantee success!
Synonyms: ensure / insure / assure / secure
guarantee (v.)
promise to do or accomplish;
guarantee to free the prisoners
Synonyms: undertake
guarantee (v.)
stand behind and guarantee the quality, accuracy, or condition of;
Synonyms: warrant
2
guarantee (n.)
a written assurance that some product or service will be provided or will meet certain specifications;
Synonyms: warrant / warrantee / warranty
guarantee (n.)
an unconditional commitment that something will happen or that something is true;
there is no guarantee that they are not lying
guarantee (n.)
a collateral agreement to answer for the debt of another in case that person defaults;
Synonyms: guaranty
From wordnet.princeton.edu