2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Acceleration \Ac*cel`er*a"tion\, n. [L. acceleratio: cf F.
acc['e]l['e]ration.]
The act of accelerating, or the state of being accelerated;
increase of motion or action as a falling body moves toward
the earth with an acceleration of velocity; -- opposed to
{retardation}.
A period of social improvement, or of intellectual
advancement, contains within itself a principle of
acceleration. --I. Taylor.
(Astr. & Physics.)
{Acceleration of the moon}, the increase of the moon's mean
motion in its orbit, in consequence of which its period of
revolution is now shorter than in ancient times.
{Acceleration} and {retardation of the tides}. See {Priming
of the tides}, under {Priming}.
{Diurnal acceleration of the fixed stars}, the amount by
which their apparent diurnal motion exceeds that of the
sun, in consequence of which they daily come to the
meridian of any place about three minutes fifty-six
seconds of solar time earlier than on the day preceding.
{Acceleration of the planets}, the increasing velocity of
their motion, in proceeding from the apogee to the perigee
of their orbits.
From WordNet r 1.6 [wn]:
acceleration
n 1: increase in velocity [ant: {deceleration}]
2: the act of accelerating; increasing the speed [syn: {quickening},
{speedup}]
3: (physics) a rate of change of velocity
more about acceleration
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Lake Atitlan, Guatemala
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