deceleration

deceleration
    n 1: a decrease in rate of change; "the deceleration of the arms
         race" [syn: {deceleration}, {slowing}, {retardation}] [ant:
         {acceleration}]
    2: (physics) a rate of decrease in velocity [ant:
       {acceleration}]
    3: the act of decelerating; decreasing the speed; "he initiated
       deceleration by braking" [ant: {acceleration}, {quickening},
       {speedup}]
    

deceleration \deceleration\ n.
   a decrease in velocity. Opposite of {acceleration}

   Syn: slowing, retardation.
        [WordNet 1.5]
    

71 Moby Thesaurus words for "deceleration":
      arrest, arrestation, catabasis, check, collapse, constraint,
      control, cooling, cooling down, cooling off, crash, curb,
      curtailment, declension, decline, decline and fall, decrescendo,
      delay, detention, diminuendo, dive, downtrend, downturn, drag,
      drop, dwindling, ease-off, ease-up, ebb, fall, flagging, hindrance,
      holdup, inhibition, injunction, interdict, lag, lapse,
      legal restraint, letdown, letup, minus acceleration, monopoly,
      obstruction, plunge, prohibition, protection, protectionism,
      protective tariff, rationing, rein, remission, restraint,
      restraint of trade, retardation, retardment, retreat, retrenchment,
      self-control, setback, slack-up, slackening, slowdown, slowing,
      slowing down, slowup, slump, subsidence, tariff wall,
      thought control, wane