1.  gravitation(n = noun.phenomenon) gravitational attraction, gravitational force, gravity - (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"
is a kind of attraction, attractive force
has particulars: solar gravity
Derived forms verb gravitate₃, adjective gravitational₁

2.  gravitation(n = noun.event) - movement downward resulting from gravitational attraction; "irrigation by gravitation rather than by pumps"
is a kind of change of location, travel
has particulars: drop, fall
Antonym: levitation
Derived forms verb gravitate₃, adjective gravitational₁

3.  gravitation(n = noun.cognition) - a figurative movement toward some attraction; "the gravitation of the middle class to the suburbs"
is a kind of drift, movement, trend
Derived forms verb gravitate₂, verb gravitate₁

1.  The act of gravitating. [1913 Webster]

2.  That species of attraction or force by which all bodies or particles of matter in the universe tend toward each other; called also attraction of gravitation, universal gravitation, and universal gravity. See Attraction, and Weight. [1913 Webster]

gravitation, n. Physics 1 a force of attraction between any particle of matter in the universe and any other.
2 the effect of this, esp. the falling of bodies to the earth.

Etymology:
mod.L gravitatio (as GRAVITY)

N  gravity, gravitation, weight, heaviness, specific gravity, pondorosity, pressure, load, burden, burthen, ballast, counterpoise, lump of, mass of, weight of, lead, millstone, mountain, Ossa on Pelion, weighing, ponderation, trutination, weights, avoirdupois weight, troy weight, apothecaries' weight, grain, scruple, drachma, ounce, pound, lb, arroba, load, stone, hundredweight, cwt, ton, long ton, metric ton, quintal, carat, pennyweight, tod, gram, centigram, milligram, microgram, kilogram, nanogram, picogram, femtogram, attogram, balance, scale, scales, steelyard, beam, weighbridge, spring balance, piezoelectric balance, analytical balance, two-pan balance, one-pan balance, postal scale, baby scale, statics, weighty, weighing, heavy as lead, ponderous, ponderable, lumpish, lumpy, cumbersome, burdensome, cumbrous, unwieldy, massive, incumbent, superincumbent.

constant of gravitation, gravitation wave, law of gravitation, newton's law of gravitation, newton's theory of gravitation, theory of gravitation