This is the 480th most frequent Serbian word.
деци
"Деци" in Serbian means "to the children" or "for the children."
Here, 'деци' is in the dative plural form, used to indicate the indirect object (to/for the children).
Деци смо купили нове играчке.
We bought new toys for the children.
In this sentence, 'деци' again is in the dative plural form, showing the recipients of the action (to the children).
Причали смо приче деци пре спавања.
We told stories to the children before bedtime.
Here, 'деци' is in the dative plural form, used to indicate to whom something is necessary or applies (needed by the children).