Meaning

• Authorization or certification; a sanction, as given by a superior.

• Something that provides assurance or confirmation; a guarantee or proof.

  "a warrant of authenticity; a warrant for success"

• An order that serves as authorization; especially a voucher authorizing payment or receipt of money.

• An option, usually issued together with another security and with a term at issue greater than a year, to buy other securities of the issuer.

• A judicial writ authorizing an officer to make a search, seizure, or arrest, or to execute a judgment.

  "an arrest warrant issued by the court"

• Short for warrant officer.

• A document certifying that a motor vehicle meets certain standards of mechanical soundness and safety; a warrant of fitness.

• A defender, a protector.

• Underclay in a coal mine.

Meaning

• To protect, keep safe (from danger).

• To give (someone) an assurance or guarantee (of something); also, with a double object: to guarantee (someone something).

• To guarantee (something) to be (of a specified quality, value, etc.).

• To guarantee as being true; (colloquially) to believe strongly.

  "That tree is going to fall, I’ll warrant."

• To authorize; to give (someone) sanction or warrant (to do something).

  "I am warranted to search these premises fully."

• To justify; to give grounds for.

  "Circumstances arose that warranted the use of lethal force."