[af-ter-bur-ning, ahf-]
Aeronautics. combustion in an afterburner that results from the injection of fuel into the exhaust gases of a jet engine to produce additional thrust with more efficient fuel consumption.
Rocketry. an irregular burning of residual fuel in some rocket motors after the cessation of the main burning.

1885–90; after + burning, translation of German Nachbrennen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
afterburning (ˈɑːftəˌbɜːnɪŋ)
1.  Also called: reheat a process in which additional fuel is ignited in the exhaust gases of a jet engine to produce additional thrust
2.  irregular burning of fuel in a rocket motor after the main burning has ceased
3.  persistence of combustion in an internal-combustion engine, either in an incorrect part of the cycle or after the ignition has been switched off

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Following the combustion chamber there should be allowance for afterburning, which nay be accommodated in insulated ducts.
It is provided for potential future use as an afterburning chamber for ex- haust gas deodorization.
Second, a deflector plate was installed to spread the bottom ash evenly across the afterburning grate.
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