from
The Collaborative International Dictionary of English v.0.48
Guaranty \Guar"an*ty\, n.; pl. {Guaranies}. [OF. guarantie,
garantie, F. garantie, OF. guarantir, garantir, to warrant,
to guaranty, E. garantir, fr. OF. guarant, garant, a
warranter, F. garant; of German origin, and from the same
word as warranty. See {Warrant}, and cf. {Warranty},
{Guarantee}.]
In law and common usage: An undertaking to answer for the
payment of some debt, or the performance of some contract or
duty, of another, in case of the failure of such other to pay
or perform; a guarantee; a warranty; a security.
[1913 Webster]