The development of cities is the
origin of the word, it's not the
current meaning, at best, it's one part of that meaning.
Pretty much all words work this way - see the joke thread under this one saying that the perpetrators in this case shouldn't be called vandals because that's originally the name of a specific German tribe.
The current colloquial definition of civilization almost certainly includes aboriginal society, and from what I can see from a quick online search, the current academic definition often does too - at least, I was able to find several references to Aboriginal civilization in a quick and casual search. However I also checked a few definitions of the word and it seems that's technically incorrect - large scale technical achievements (for example, but not exclusively, cities) are a requirement to be considered a civilization.
Looking a bit deeper, however, I did find some articles pointing out that this definition of civilization is a Eurocentric view and that we should broaden the official scope of the word to include Aboriginal culture since they had a very high level of development in other areas, just not the ones that led to building cities. That seems reasonable to me. It's important not to get hung up on the historical origin of words. Instead we should focus on the most useful definition for us modern humans who are hopefully working towards a more inclusive understanding of the world.
https://mahb.stanford.edu/library-item/australian-aboriginal...