This is the 100th most frequent Portuguese word.
população
The total number of people inhabiting a particular area or region.
In this sentence, the word 'população' is used as a noun referring to the group of people inhabiting a city.
A população da cidade cresceu rapidamente.
The population of the city has grown quickly.
Here, 'população' signifies the collective individuals voicing concern about a communal issue, showing a contextual collective use.
A população reclama sobre os altos preços.
The population complains about the high prices.
In this instance, 'população' is used to denote a demographic group with shared characteristics within the context.