Definition of surety

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sur·e·ty    (shr-t) KEY 

NOUN:
pl. sur·e·ties

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.

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ETYMOLOGY:
Middle English surte, from Old French, from Latin scrits, from scrus, sure ; see secure

OTHER FORMS:
sure·ty·ship(Noun)