This is the 325th most frequent Greek word.
εθνικής
The Greek word "εθνικής" translates to "national" in English.
In this context, "εθνικής" is an attributive adjective affecting 'εορτές' (holidays), indicating these events are of national importance.
Γιορτάζουμε τις εθνικής μας εορτές με πολλή περηφάνια.
We celebrate our national holidays with much pride.
Here, "εθνικής" is used attributively in the genitive case, modifying 'χρώματα' (colors) to denote that they represent the nation.
Η σημαία της χώρας μας έχει τα εθνικής μας χρώματα.
The flag of our country has our national colors.
In this sentence, "εθνικής" functions as an attributive adjective in genitive case, describing 'οδός' (road) to indicate its national significance.