surety

sur·e·ty

1. The condition of being sure, especially of oneself; self-assurance.
2. Something beyond doubt; a certainty.
3. A pledge or formal promise made to secure against loss, damage, or default; a security.
4. One who has contracted to be responsible for another, especially one who assumes responsibilities or debts in the event of default.

Origin: Middle English surte, from Old French, from Latin sēcūritās, from sēcūrus, sure; see secure .

Related Forms:

• suretyship surˈe·ty·shipˌ noun