Definitions for: Acceleration


[n] the act of accelerating; increasing the speed
[n] an increase in speed; "modern science caused an acceleration of cultural change"
[n] (physics) a rate of change of velocity



Webster (1913) Definition: 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.

Synonyms: quickening, speedup

Antonyms: deceleration, retardation, slowing

See Also: centripetal acceleration, fastness, getaway, hurrying, pickup, precipitation, rate, speed, speed, speeding, swiftness

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