Definition of warrants:
(n) :
(law, countable) A judicial writ authorizing an officer to make a search, seizure, or arrest, or to execute a judgment.
(n) :
(countable) An order that serves as authorization; especially a voucher authorizing payment or receipt of money.
(n) :
(countable) Something that provides assurance or confirmation; a guarantee or proof.
(n) :
Authorization or certification; a sanction, as given by a superior.
(v) :
(transitive) To authorize; to give (someone) sanction or warrant (to do something).
(v) :
(transitive) To guarantee (something) to be (of a specified quality, value, etc.).