reciprocation
noun
- act of responding in kind, building a relationship of mutual dependency
- act or process of moving back and forth alternately
Wiktionary
noun
Etymology: Etymology tree English reciprocate Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English -ion English reciprocation From reciprocate + -ion.
- The act of reciprocating; interchange of acts; a mutual giving and returning.
“the reciprocation of kindness”
- Alternate recurrence or action; as, the reciprocation of the sea in the flow and ebb of tides, or the back and forth motion in a piston engine.
“Near-synonym: oscillation”
“... the same pendulum alwayes maketh its reciprocations in equall times.”