gravitation

(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

movement downward resulting from gravitational attraction; "irrigation by gravitation rather than by pumps"

a figurative movement toward some attraction; "the gravitation of the middle class to the suburbs"