warrant
war-rant
noun
An official document issued by a court authorising an arrest, search, or other action.
"The police obtained an arrest warrant."
verb
To justify or necessitate a particular course of action or response.
"His behaviour warrants an investigation."
Thesaurus
Synonyms: endorsement, imprimatur, sanction, indorsement, countenance, guarantee, stock-purchase warrant, stock warrant, warrantee, warranty