any engine employing the rectilinear motion of one or more pistons in cylinders.
Origin of reciprocating engine
First recorded in 1815–25
Also called displacement engine, piston engine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an engine in which one or more pistons move backwards and forwards inside a cylinder or cylinders
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012