This is the 284th most frequent Croatian word.
sustava
The Croatian word "sustava" means "system" in English (genitive singular form of "sustav").
Here, 'sustav' denotes a natural biological arrangement of components working together, specifically the immune system.
Ljudski imunološki sustav igra ključnu ulogu u obrani od bolesti.
The human immune system plays a key role in defending against diseases.
The word 'sustav' here refers to a physical system, in this case, irrigation hardware and layout enabling water distribution.
Sustav za navodnjavanje ovog polja je vrlo učinkovit.
The irrigation system for this field is very efficient.
In this instance, 'sustav' pertains to an organized digital framework or set of software supporting information management.