The term used to define the exact location of an earthquake is the epicenter.

Here's a breakdown:

* Epicenter: The point on the Earth's surface directly above the focus (hypocenter). This is the location where the earthquake's seismic waves first reach the surface and where the strongest shaking is usually felt.

* Focus (Hypocenter): The point inside the Earth where the earthquake originates. This is where the rupture first occurs along a fault.

So, while the earthquake originates at the focus, the epicenter is the location on the Earth's surface directly above it, and is used to pinpoint where the earthquake occurred.