CO-OPERATION

\kˈə͡ʊˌɒpəɹˈe͡ɪʃən], \kˈə‍ʊˌɒpəɹˈe‍ɪʃən], \k_ˈəʊ_ˌɒ_p_ə_ɹ_ˈeɪ_ʃ_ə_n]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1871 - The Cabinet Dictionary of the English Language