The Collaborative International Dictionary
Guaranty \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.
WordNet
See guaranty
n. a collateral agreement to answer for the debt of another in case that person defaults [syn: guarantee]
[also: guarantied]