Definitions from Wiktionary ( )

▸ noun:  Authorization or certification; a sanction, as given by a superior.
▸ noun:  (countable) Something that provides assurance or confirmation; a guarantee or proof.
▸ noun:  (countable) An order that serves as authorization; especially a voucher authorizing payment or receipt of money.
▸ noun:  (finance, countable) 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.
▸ noun:  (law, countable) A judicial writ authorizing an officer to make a search, seizure, or arrest, or to execute a judgment.
▸ noun:  (countable) A certificate of appointment given to a warrant officer.
▸ noun:  (New Zealand, road transport, countable) A document certifying that a motor vehicle meets certain standards of mechanical soundness and safety; a warrant of fitness.
▸ noun:  (obsolete, countable) A defender, a protector.
▸ noun:  (mining, uncountable) Underclay in a coal mine.
▸ verb:  (transitive, obsolete) To protect, keep safe (from danger).
▸ verb:  (transitive, obsolete) To give (someone) an assurance or guarantee (of something); also, with a double object: to guarantee (someone something).
▸ verb:  (transitive) To guarantee (something) to be (of a specified quality, value, etc.).
▸ verb:  (transitive) To guarantee as being true; (colloquial) to believe strongly.
▸ verb:  (transitive) To authorize; to give (someone) sanction or warrant (to do something).
▸ verb:  (transitive) To justify; to give grounds for.
▸ noun:  (military, countable) Short for warrant officer. [(military) An officer holding rank by virtue of a warrant rather than a commission.]

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