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- n. An engine in which the pistons perform four strokes per engine cycle (i.e. intake, compression, power, exhaust).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
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