The act of revolving, or turning round on an
axis or a center; the motion of a body round a fixed point or line;
rotation; as, the revolution of a wheel, of a top, of the earth
on its axis, etc.
Return to a point before occupied, or to a
point relatively the same; a rolling back; return; as,
revolution in an ellipse or spiral.
The space measured by the regular return of
a revolving body; the period made by the regular recurrence of a
measure of time, or by a succession of similar events.
The motion of any body, as
a planet or satellite, in a curved line or orbit, until it returns to
the same point again, or to a point relatively the same; -- designated
as the annual, anomalistic, nodical,
sidereal, or tropical revolution, according as the point
of return or completion has a fixed relation to the year, the anomaly,
the nodes, the stars, or the tropics; as, the revolution of the
earth about the sun; the revolution of the moon about the
earth.
The motion of a point, line,
or surface about a point or line as its center or axis, in such a
manner that a moving point generates a curve, a moving line a surface
(called a surface of revolution), and a moving surface a solid
(called a solid of revolution); as, the revolution of a
right-angled triangle about one of its sides generates a cone; the
revolution of a semicircle about the diameter generates a
sphere.
A total or radical change; as, a
revolution in one's circumstances or way of living.
A fundamental change in
political organization, or in a government or constitution; the
overthrow or renunciation of one government, and the substitution of
another, by the governed.
In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
