CO-EFFICIENCY

\kˈə͡ʊɪfˈɪʃənsi], \kˈə‍ʊɪfˈɪʃənsi], \k_ˈəʊ_ɪ_f_ˈɪ_ʃ_ə_n_s_i]\
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1871 - The Cabinet Dictionary of the English Language

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drill site

  • workplace that is the site of a drill hole
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