Reciprocating

[ri-sip-ruh-keyt] /rɪˈsɪp rəˌkeɪt/

verb (used with object), reciprocated, reciprocating.
1.
to give, feel, etc., in return.
2.
to give and receive ; interchange:
to reciprocate favors.
3.
to cause to move alternately backward and forward.
verb (used without object), reciprocated, reciprocating.
4.
to make a return, as for something given.
5.
to make interchange.
6.
to be correspondent.
7.
to move alternately backward and forward.
/rɪˈsɪprəˌkeɪt/
verb
1.
to give or feel in return
2.
to move or cause to move backwards and forwards
3.
(intransitive) to be correspondent or equivalent
adj.

“moving back and forth,” 1690s, present participle adjective from reciprocate (v.). Specifically of machines by 1822.
v.

“to return, requite,” 1610s, back-formation from reciprocation, or else from Latin reciprocatus, past participle of reciprocare “rise and fall, move back and forth; reverse the motion of,” from reciprocus (see reciprocal). Related: Reciprocated; reciprocating.

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Reciprocating-engine
noun 1. any engine employing the rectilinear motion of one or more pistons in cylinders. noun 1. an engine in which one or more pistons move backwards and forwards inside a cylinder or cylinders
Reciprocation
[ri-sip-ruh-key-shuh n] /rɪˌsɪp rəˈkeɪ ʃən/ noun 1. an act or instance of . 2. a returning, usually for something given. 3. a mutual giving and receiving. 4. the state of being or corresponding. n. 1520s, “mode of expression;” 1560s, “act of reciprocating,” from Latin reciprocationem (nominative reciprocatio) “retrogression, alternation, ebb,” noun of action from past […]
Reciprocative
[ri-sip-ruh-keyt] /rɪˈsɪp rəˌkeɪt/ verb (used with object), reciprocated, reciprocating. 1. to give, feel, etc., in return. 2. to give and receive ; interchange: to reciprocate favors. 3. to cause to move alternately backward and forward. verb (used without object), reciprocated, reciprocating. 4. to make a return, as for something given. 5. to make interchange. 6. […]

Reciprocator
[ri-sip-ruh-keyt] /rɪˈsɪp rəˌkeɪt/ verb (used with object), reciprocated, reciprocating. 1. to give, feel, etc., in return. 2. to give and receive ; interchange: to reciprocate favors. 3. to cause to move alternately backward and forward. verb (used without object), reciprocated, reciprocating. 4. to make a return, as for something given. 5. to make interchange. 6. […]
Reciprocity
[res-uh-pros-i-tee] /ˌrɛs əˈprɒs ɪ ti/ noun 1. a state or relation. 2. ; mutual exchange. 3. the relation or policy in commercial dealings between countries by which corresponding advantages or privileges are granted by each country to the citizens of the other. /ˌrɛsɪˈprɒsɪtɪ/ noun (pl) -ities 1. reciprocal action or relation 2. a mutual exchange […]