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HYPHEN
WORDNET DICTIONARY
THESAURUS

WORDNET DICTIONARY

Noun deceleration has 3 senses

• deceleration(n = noun.attribute) retardation, slowing - a decrease in rate of change; "the deceleration of the arms race"
is a kind of alteration, change, modification
Antonym: acceleration
Derived forms verb decelerate₂, verb decelerate₁

• deceleration(n = noun.time) Array - (physics) a rate of decrease in velocity; Array
is a kind of rate
Antonym: acceleration

• deceleration(n = noun.act) Array - the act of decelerating; decreasing the speed; "he initiated deceleration by braking"
is a kind of hurrying, speed, speeding
Antonym: acceleration

THESAURUS

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

For further exploring for "deceleration" in Webster Dictionary Online