From WordNet (r) 2.0 (August 2003) [wn]:
gravitation
n 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 [syn:
gravity, gravitational attraction, {gravitational
force}]
2: movement downward resulting from gravitational attraction;
"irrigation by gravitation rather than by pumps" [ant:
levitation]
3: a figurative movement toward some attraction; "the
gravitation of the middle class to the suburbs"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Gravitation \Grav"i*ta"tion\, n. [Cf. F. gravitation. See
Gravity.]
1. The act of gravitating.
[1913 Webster]
2. (Pysics) 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]
Law of gravitation, that law in accordance with which
gravitation acts, namely, that every two bodies or
portions of matter in the universe attract each other with
a force proportional directly to the quantity of matter
they contain, and inversely to the squares of their
distances.
[1913 Webster]