reciprocation

reciprocate +‎ -ion

• Rhymes: -eɪʃən

reciprocation (countable and uncountable, plural reciprocations)

1. The act of reciprocating; interchange of acts; a mutual giving and returning

   the reciprocation of kindness

2. Alternate recurrence or action; as, the reciprocation of the sea in the flow and ebb of tides; oscillation.
   • 1662, Thomas Salusbury, Galileo's Dialogue Concerning the Two Chief World Systems, Dialogue 2:

     ... the same pendulum alwayes maketh its reciprocations in equall times.

• requital
• retaliation

• “reciprocation”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.
• “reciprocation”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• John A. Simpson and Edmund S. C. Weiner, editors (1989), “reciprocation”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, →ISBN.