authorisation in WordNet English dictionary

1. the act of conferring legality or sanction or formal warrant
   authorization  authorisation  empowerment 
   
2. the power or right to give orders or make decisions
   "he has the authority to issue warrants"; "deputies are given authorization to make arrests"; "a place of potency in the state"
   authority  authorization  authorisation  potency  dominance  say-so 
   
3. official permission or approval
   "authority for the program was renewed several times"
   authority  authorization  authorisation  sanction 
   
4. a document giving an official instruction or command
   mandate  authorization  authorisation 
   

authorisation in English Wiktionary