gravitation

n. force of gravity, force of attraction between two masses; tendency to move toward

Gravitation is a natural phenomenon by which all objects with mass attract each other. In everyday life, gravitation is most familiar as the agency that endows objects with weight. It is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth, for the formation of tides; for convection (by which hot fluids rise); for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena that we observe. Gravitation is also the reason for the very existence of the Earth, the Sun, and most macroscopic objects in the universe; without it, matter would not have coalesced into these large masses and life, as we know it, would not exist.
See more at Wikipedia.org...

Grav·i·ta·tion n. 1. The natural phenomenon of attraction between massive bodies. 2. The act or process of moving under the influence of this [more]Gravitation - Community and Resources

Noun
1. (physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface; "the more remote the body the less the gravity"; "the gravitation between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them"; "gravitation cannot be held responsible for people falling in love"--Albert Einstein
(synonym) gravity, gravitational attraction, gravitational force
(hypernym) attraction, attractive force
(hyponym) solar gravity
(derivation) gravitate
(classification) physics, physical science, natural philosophy
2. movement downward resulting from gravitational attraction; "irrigation by gravitation rather than by pumps"
(antonym) levitation
(hypernym) change of location, travel
(hyponym) drop, fall
(derivation) gravitate
3. a figurative movement toward some attraction; "the gravitation of the middle class to the suburbs"
(hypernym) drift, trend, movement
(derivation) gravitate

n. gravitation, force of gravity, force of attraction between two masses; tendency to move toward