RECIPROCOUS

\ɹɪsɪpɹˈɒkəs], \ɹɪsɪpɹˈɒkəs], \ɹ_ɪ_s_ɪ_p_ɹ_ˈɒ_k_ə_s]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald