What do a.m. and p.m. stand for?

piston engine

Origin of piston engine
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for piston engine
  • Electric vehicle technology will not replace the diesel truck fleets or piston engine airplanes or stationary power units.
  • Even a piston engine would be at risk if the air filters were not adequate.
  • In the piston engine, the basic element is the combustion chamber.

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