This is the 2658th most frequent Portuguese word.
nação
"Nation; a collective group of people sharing common culture, history, or territory."
In this sentence, 'nação' refers to the collective population and territory organized under a single government and identity.
A nação celebrou sua independência ontem.
The nation celebrated its independence yesterday.
Here, 'nação' is used to define the shared cultural and historical identity of a group of people within the boundaries of a country.
A diversidade cultural é uma característica importante de nossa nação.
Cultural diversity is an important characteristic of our nation.
In this case, 'nação' implies the concept of unity and collective progress for the country or its people.