\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.

\Guar"an*ty\, v. t. [imp. & p. p. {Guarantied}; p. pr.
& vb. n. {Guarantying}.] [From {Guaranty}, n.]
In law and common usage: To undertake or engage that another
person shall perform (what he has stipulated); to undertake
to be answerable for (the debt or default of another); to
engage to answer for the performance of (some promise or duty
by another) in case of a failure by the latter to perform; to
undertake to secure (something) to another, as in the case of
a contingency. See {Guarantee}, v. t.
Note: Guaranty agrees in form with warranty. Both guaranty
      and guarantee are well authorized by legal writers in
      the United States. The prevailing spelling, at least
      for the verb, is guarantee.