This is the 862nd most frequent Croatian word.
veliko
"Veliko" means "big" or "large" in English.
Here, 'veliko' is used as an adjective to describe the noun 'povjerenje', indicating a large or significant amount.
Imam veliko povjerenje u tebe.
I have great trust in you.
Although 'veća' is used here, note that it is the comparative form of 'veliko', implying comparison and degree of size.
Ulica je puno veća nego što sam mislio.
The street is much bigger than I thought.
The word 'veliko' is utilized as an adjective to emphasize the importance or size of the 'pitanje'.