'Half' in the Bible

Then said the king unto her, What wilt thou, queen Esther? and what is thy request? it shall be given thee even to the half of the kingdom.

And the king said unto Esther at the banquet of wine, What is thy petition? and it shall be granted thee: and what is thy request? even to the half of the kingdom it shall be performed.

And the king said again unto Esther on the second day at the banquet of wine, What is thy petition, queen Esther? and it shall be granted thee: and what is thy request? even to the half of the kingdom it shall be performed.