This is the 4303rd most frequent Spanish word.
portuaria
"Portuaria" means "port-related" or "pertaining to a port."
Here, 'portuaria' is an adjective describing activity ('actividad'), indicating that it relates to the port.
La actividad portuaria es crucial para la economía del país.
Port activity is crucial for the country's economy.
In this sentence, 'portuaria' is describing 'zona' (zone), specifying that it pertains to the port.
La zona portuaria fue renovada recientemente.
The port zone was recently renovated.
Here, 'portuaria' describes 'instalación' (facility), again linking it to the port.