This is the 689th most frequent Croatian word.
milijardi
"Milijardi" in Croatian means "billions" in English.
The word 'milijardi' here is in the genitive plural case because it follows the quantifier 'sedam', denoting 'billion people'.
Na svijetu ima preko sedam milijardi ljudi.
There are over seven billion people in the world.
The word 'milijarde' here is in the dative plural case, used in relation to the value of the investment.
Razgovarali su o investiciji vrijednoj tri milijarde kuna.
They discussed an investment worth three billion kuna.
The word 'milijarde' here is in the accusative plural case, matching the feminine noun form for the amount described.