This is the 8010th most frequent Polish word.
narodowa
"Narodowa" means "national" in English.
In this sentence, 'narodowa' modifies 'flaga' and describes it as pertaining to the nation of Poland.
Flaga narodowa Polski jest biało-czerwona.
The national flag of Poland is white and red.
In this context, 'narodowa' modifies 'duma,' indicating pride associated with the nation.
Duma narodowa często objawia się podczas międzynarodowych zawodów sportowych.
National pride often manifests during international sports competitions.
Here, 'narodowa' describes 'biblioteka,' categorizing it as the institution designated at the national level.