This is the 329th most frequent Portuguese word.
estadual
"Estadual" means "related to a state."
Here, 'estadual' modifies 'rodovia' (highway), indicating that it is managed at the state level.
A rodovia estadual está em boas condições.
The state highway is in good condition.
In this sentence, 'estadual' describes 'escola' (school), showing that it is part of the public school system managed by the state.
Ela trabalha em uma escola estadual como professora.
She works in a state school as a teacher.
'Estadual' in this context relates to 'time' (team), signifying that the team represents the state in the competition.