Interesting enough
the people living in one particular area
or
people who are considered as a unit because of their common interests,
(and finally to add more fuss)
social group, or nationality
Check the date of this definition and you will discover that things started to get weird when we changed the meaning of the word extending them to semantic meaning that did not fit at all with the new reality therefore we started to apply ancient rules to completely new reality with completely different dynamics.
This is the reason because I cited an etymological dictionary.
The second definition from the Cambridge Dictionary is a modern extension of the primary meaning while the rest is just noise.
We start to learning reading around 6 years old but some people never understand what they read, in fact. Which would not be a great problem unless they would recognize it, but obviously they do not. It would not still a big problem either, until others leverage this lack of awareness. It would even not a problem of mine unless someone brings it on my work desktop, then it started be a serious issue.