1. The state if being sure; sureness; assurance.
2. Something sure; certainty.
3. Something that makes sure, protects, or gives assurance, as against loss, damage, or default; guarantee; security.
4. A person who makes himself responsible for another; specifically, in
law, one who makes himself liable for another's debts, defaults of
5. Evidence; ratification; confirmation.
Webster's Dictionary 2nd Edition Unabridged