Extent (noun)

1. The degree or amount to which something is or happens.
2. The area or space covered or occupied by something.

Origin:

Late middle english: from old french, from latin extentus "a stretching out", from ex- "out" + tendere "to stretch".

Examples:

1. The extent of the damage caused by the hurricane is still being assessed.
2. The extent of the forest has decreased dramatically due to deforestation.
3. The extent of his knowledge in this area is truly impressive.
4. The extent of her abilities as a singer is the subject of much discussion and debate.
5. The extent of the problem was much greater than anyone had initially realized.