Question

What does gravity mean in physics?

Answer 1

The two main physics concepts of gravity are simply the attractive force between two bodies, or the more complex idea of the effect of space-time curvature.

Explanation:

For practical problems we are usually looking at the effect of mass on the attractive force between bodies (celestial mechanics). That is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.
`F = G((m_1m_2)/r^2)` (Newton's Law of Gravitation)

In Einstein's General Theory of Relativity the concept of space-time curvature was developed as a description of the gravitational force.
https://science.howstuffworks.com/environmental/earth/geophysics/question2322.htm