Gravitation (noun)

1. The natural force by which a planet or other body draws objects toward its center.
2. The force of attraction between any two masses.

Origin:

From latin gravitatio, from gravis (heavy) + -atio (action or process).

Examples:

1. Earth's gravitation keeps us on the ground.
2. The gravitation between the Earth and Moon causes tides.
3. The force of gravitation is inversely proportional to the square of the distance between two bodies.
4. The gravitation of a black hole is so strong that nothing, not even light, can escape it.
5. Gravitation is one of the four fundamental forces of nature.