Gravity is an interaction, and as such is defined in the interaction glossary. Please see:
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gravity (near-earth) (Modeling Applied to Problem Solving) — The gravitational force exerted by the earth on an object near the earth's surface.
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gravitation (universal) (Modeling Applied to Problem Solving) — An interaction between two massive particles resulting in an attractive force exerted on each by the other. The force is proportional to the gravitational constant G =
6.674 28(67) x 10-11 m3 kg-1 s-2, and the masses of the bodies, and inversely proportional to the square of the distance between them.