Webster's English Dictionary

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reciprocation

re.cip.ro.ca.tion \ri-.sip-r*-'ka--sh*n\ \ri-'sip-r*-.ka-t-iv, -k*t-\ n 1a: 
   a mutual exchange  1b: a return in kind or of like value  2: an alternating 
   motion  - re.cip.ro.ca.tive aj