This is the 123rd most frequent Finnish word.
lasten
"Lasten" means "children's" in English, indicating possession.
Here, 'lasten' is the genitive plural form of 'lapsi' (child) used to show possession, indicating something belonging to children, in this case, the toys.
Lasten lelut ovat olohuoneessa.
The children's toys are in the living room.
In this usage, 'lasten' is in the genitive plural form, positioning the phrase 'lasten iloksi' (for the joy of children) which shows intention or reason.
Kirja on kirjoitettu lasten iloksi.
The book was written for the children's joy.
Here, 'lasten' describes the type of movie, specifying it is directed towards children, following the noun as a descriptor.