v.
1. tr. return or requite (affection etc.).
2 intr. (foll. by with) offer or give something in return (reciprocated with an invitation to lunch).
3 tr. give and receive mutually; interchange.
4 a intr. (of a part of a machine) move backwards and forwards. b tr. cause to do this.
Phrases and idioms:
reciprocating engine an engine using a piston or pistons moving up and down in cylinders.
Derivatives:
reciprocation n. reciprocator n.
Etymology: L reciprocare reciprocat- (as RECIPROCAL)