CO-OPERATOR

\kˈə͡ʊˈɒpəɹˌe͡ɪtə], \kˈə‍ʊˈɒpəɹˌe‍ɪtə], \k_ˈəʊ_ˈɒ_p_ə_ɹ_ˌeɪ_t_ə]\
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1871 - The Cabinet Dictionary of the English Language