Definitions
1.verbTo protect, keep safe (from danger).
2.verbTo give (someone) an assurance or guarantee (of something); also, with a double object: to guarantee (someone something).
3.verbTo guarantee (something) to be (of a specified quality, value, etc.).
4.verbTo guarantee as being true; (colloquially) to believe strongly."That tree is going to fall, I’ll warrant."
5.verbTo authorize; to give (someone) sanction or warrant (to do something)."I am warranted to search these premises fully."
6.verbTo justify; to give grounds for."Circumstances arose that warranted the use of lethal force."
7.adjectiveAuthorized with a warrant.
8.adjectiveDeserved, necessary, appropriate."Under the circumstances, his outburst was not warranted."