acceleration

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ækˌsɛləˈreɪʃ^ən/

US:USA pronunciation: IPAUSA pronunciation: IPA/ækˌsɛləˈreɪʃən/

US:USA pronunciation: respellingUSA pronunciation: respelling(ak sel′ə rā′shən)

ac•cel•er•a•tion n.

the act of accelerating;
increase of speed or velocity.
a change in velocity.
Mechanicsthe time rate of change of velocity with respect to magnitude or direction;
the derivative of velocity with respect to time.

Collins Concise English Dictionary © HarperCollins Publishers::

acceleration /ækˌsɛləˈreɪʃən/ n

ac•cel•er•ate v., -at•ed, -at•ing.

to (cause to) develop, progress, or advance faster: [no object]The unemployment rate accelerated.[~ + object]Those policies accelerated unemployment.
to increase the speed (of): [~ + object]The driver accelerated the car.[no object]The car accelerated.
to hasten the occurrence of:[~ + object]The economic policies accelerated the recession.

ac•cel•er•a•tion n. [uncountable]See -celer-.

ac•cel•er•ate v., -at•ed, -at•ing.
v.t.

to cause faster or greater activity, development, progress, advancement, etc., in:to accelerate economic growth.
to hasten the occurrence of:to accelerate the fall of a government.
Mechanicsto change the velocity of (a body) or the rate of (motion);
cause to undergo acceleration.
to reduce the time required for (a course of study) by intensifying the work, eliminating detail, etc.

v.i.

Latin accelerātus speeded up (past participle of accelerāre), equivalent. to ac- ac- + celer swift + -ātus -ate¹
1515–25

ac•cel′er•a•ble, adj.
ac•cel′er•at′ed•ly, adv.

'acceleration' also found in these entries (note: many are not synonyms or translations):

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