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Pronunciation:  ak`selu'reyshun

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

ACCELERATION is a 12 letter word that starts with A.


 Synonyms: quickening, speedup
 Antonyms: deceleration, retardation, slowing
 See Also: centripetal acceleration, fastness, getaway, hurrying, pickup, precipitation, rate, speed, speed, speeding, swiftness



Webster's 1913 Dictionary
\Ac*cel`er*a"tion\, n. [L. acceleratio: cf. F.
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

      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.

Thesaurus Terms
 Related Terms: accelerando, aggravation, beefing-up, blowing up, blowup, concentration, condensation, consolidation, deepening, double time, double-quick, double-quick time, drive, enhancement, exacerbation, exaggeration, explosion, festination, forced march, forwarding, getaway, hastening, heating-up, heightening, hurrying, impetus, information explosion, intensification, magnification, pickup, population explosion, quickening, redoubling, reinforcement, speeding, speedup, step-up, strengthening, thrust, tightening