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Webster's 1828 Dictionary

RECIPROCATING

ppr. Interchanging; each giving or doing to the other the same thing.

 

New American Oxford Dictionary

reciprocating engine

re cip ro cat ing en gine ▶noun an engine in which one or more pistons move up and down in cylinders; a piston engine.

 

Oxford Dictionary

reciprocating engine

re |cip ¦ro |cat ¦ing en ¦gine ▶noun an engine in which one or more pistons move up and down in cylinders; a piston engine.