surety

Noun

• a guarantee that an obligation will be met

• one who provides a warrant or guarantee to another

• a prisoner who is held by one party to insure that another party will meet specified terms

• property that your creditor can claim in case you default on your obligation
  • bankers are reluctant to lend without good security
    

• something clearly established

Related words

• Synonyms: 
  security , guarantor , warrantor , warranter , hostage