This is the 50th most frequent Estonian word.
kaks
The Estonian word "kaks" means "two" in English.
In this sentence, 'kaks' is used as a numeral to indicate quantity.
Mul on kaks õuna.
I have two apples.
In this sentence, 'kaks' is used as part of an adverbial phrase meaning 'twice'.
Kaks korda päevas ma käin jooksmas.
Twice a day I go running.
Here 'kahe' is the genitive form of 'kaks', used to indicate possession with time.