This is the 143rd most frequent Finnish word.
kymmenen
The Finnish word "kymmenen" means "ten" in English.
Here, 'kymmenen' denotes the numeric time 'ten'.
Kello on kymmenen aamulla.
It is ten o'clock in the morning.
In this sentence, 'kymmenen' is used as a quantity descriptor, meaning 'ten'.
Hän luki kymmenen kirjaa lomansa aikana.
He read ten books during his vacation.
Here, 'kymmenen' expresses multiplication, 'ten times'.