"Prior authorisation" refers to the approval or permission that needs to be obtained before performing a specific action or accessing certain resources. It is a process in which you have to seek permission in advance to do something. Full definition
The weapons, which have never been used before on the British mainland, can not be deployed without prior authorisation from Theresa May and City Hall admit this approval still may not come. (politics.co.uk)
In the case analyzed by the Court, the insured incurred defense costs without prior authorisation from the insurer, but upon claiming from the insurer, no response was given within the agreed 15 days. (dacbeachcroft.com)
The Akwa Ibom State Attorney - General, Mr. Uwemedimo Nwoko, had filed a suit before Justice Ntong, seeking the court to restrain the ICPC or any other federal anti-corruption agency from investigating the government of the state for alleged corrupt practices without prior authorisation by the Akwa Ibom State House of Assembly. (punchng.com)