What is the meaning of warrant?

noun

• A writ from a court commanding police to perform specified acts.
• A type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price.
  • usage: "as a sweetener they offered warrants along with the fixed-income securities"
  • synonyms: stock warrant, stock-purchase warrant
• Formal and explicit approval.
  • usage: "a Democrat usually gets the union's endorsement"
  • synonyms: sanction, countenance, endorsement, indorsement, imprimatur
• A written assurance that some product or service will be provided or will meet certain specifications.
  • synonyms: guarantee, warrantee, warranty

verb

• Show to be reasonable or provide adequate ground for.
  • usage: "The emergency does not warrant all of us buying guns"; "The end justifies the means"
  • synonyms: justify
• Stand behind and guarantee the quality, accuracy, or condition of.
  • usage: "The dealer warrants all the cars he sells"; "I warrant this information"
  • synonyms: guarantee