From this academia se question:
I am an Australian national and want to live in Australia long term.
What exactly is the meaning of Australian national? like student visa? or actual citizen? or resident?
This is from a user who has also asked questions here in travel se: Where should I get travel insurance for a Chinese student in Australia travelling to the USA and then travelling to China?
In international law, nationality and citizenship are synonymous. In domestic law, some countries distinguish between citizens and nationals, where all citizens are nationals and most nationals are citizens. I don't think Australia distinguishes between the two. So Australian citizenship is the same as Australian nationality.
I would parse it as this:
I am an Australian national
He/She is a citizen of Australia.
And want to live in Australia long term
And they are not interested in living outside of Australia
