What is the meaning of Gravity?

The state or condition of having weight; weight; heaviness.

The state or condition of being grave; seriousness.

The lowness of a note.

The phenomenon that, on earth, objects have weight; the similar phenomenon on other celestial bodies such as the moon.

Gravitation, the universal force exercised by two bodies on each other by virtue of their masses.

A law or laws of gravitation: any theory which attempts to account for the phenomena of weight and/or the mutual attraction of massive objects (Aristotelian gravity, Newtonian gravity).

Specific gravity.

Source: wiktionary.org