This is the 113th most frequent Lithuanian word.
vaikų
"Vaikų" means "children's" or "of children" in English.
Here, 'vaikų' represents the genitive plural form of 'child', denoting possession or a quantity related to children.
Mokykloje yra daug vaikų.
There are many children in the school.
'Vaikų' is in the genitive plural form, used here to describe the purpose related to children.
Mes turime naują žaidimų aikštelę vaikų saugumui.
We have a new playground for the safety of children.
In this sentence, 'vaikų' refers to the genitive plural form, indicating possession relative to 'my friends' children'.