The phrase "authorisation is a" is correct and usable in written English.
You can use it when defining or describing what authorisation represents or entails in a specific context.
Example: "Authorisation is a crucial step in the approval process for any project."
Alternatives: "authorisation constitutes a" or "authorisation serves as a".
Lesson: Keys and passwords should have a limited lifetime The Rebels' system of vouching for attendees is a way of authorising who can be at the meeting and authorisation is an important part of any secure system.
3 FDA authorisation was a historic success; however, the carbidopa/levodopa limit has resulted in important issues for patients and for clinicians.
The station said the inclusion of MVS's name within Mexicoleaks without express authorisation was "an affront and an offence".
Obama, a former constitutional law professor, has declared that he has all the authority he needs – within Iraq, at least; he wants Congress to authorise and fund US military training of Syrian rebels - yet the wellspring of that authority is a 2001 authorisation against al-Qaida, and Isis is no longer part of al-Qaida.
The Minister of Infrastructure, Maurizio Lupi, declared the protesters to be "criminals and villains": "After facing the umpteenth clash in Rome, we must have the courage to say that whoever occupies a house without authorisation is committing a crime," he declared.
Whenever an authorisation is requested for a single candidate product, comparative assessments will have to be conducted for all its uses.
In France, authorisation is required from a judge if an ethics committee rules that the research imposes serious risks to the participants.
The Government's reluctance to seek UN authorisation is based on a belief that it would face a Russian veto.
Authorisation is intended as an instrument to appropriately control the risks arising from manufacturing and use of SVHC.
In general, 'substitution' of pesticides means that an authorisation is refused or withdrawn in favour of an alternative product or a non-chemical control or prevention method which presents a 'significantly lower risk', according to Annex IV of the PPP Regulation (EC) No 1107/2009 and Article 23 of the biocidal products Regulation (EU) No 528/2012, respectively.
