Definitions
1.NounCertainty.
2.NounThat which makes sure; that which confirms; ground of confidence or security.
3.NounA promise to pay a sum of money in the event that another person fails to fulfill an obligation.
4.NounOne who undertakes to pay money or perform other acts in the event that his principal fails therein.
5.NounA substitute; a hostage.
6.NounEvidence; confirmation; warrant.