This is the 87th most frequent Estonian word.
kahe
"Kahe" means "of two" or "two's" in English.
Here, 'kahe' again is the genitive case of 'kaks,' used to refer to a time period counted by two units (days).
Kahe päeva pärast lähen ma reisile.
In two days, I am going on a trip.
In this context, 'kahe' is used in the genitive case to indicate components involved in making a choice (between two books).
Ta valis kahe raamatu vahel.
He chose between two books.
In this sentence, 'kahe' is the genitive case of 'kaks,' the numeral two, indicating possession or relationship (two of apples).