guar·an·ty /'gar-ən-tē, 'gär-/ n pl -ties [Old French garantie, from garantir to guarantee, from garant warrant]
1: a pledge to pay another's debt or to perform another's duty in case of the other's default or inadequate performance compare letter of credit
2: guarantee (3)
3: guarantor
4: something given as security: pledge
5: the protection of a right afforded by legal provision (as in a constitution)
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.