Other Word Forms of Guarantee
Origin of Guarantee
From Old French guarantie (perhaps via a later Spanish garante), from the verb guarantir (“to protect, assure, vouch for”), ultimately from Old Frankish *warjand, *warand (“a warrant”), or from guaranty. Compare guaranty, warranty.
Alteration of Middle English garant warranty from Old French guaranty
From American Heritage Dictionary of the English Language, 5th Edition
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