GRATLCULATION

\ɡɹˌatlkjʊlˈe͡ɪʃən], \ɡɹˌatlkjʊlˈe‍ɪʃən], \ɡ_ɹ_ˌa_t_l_k_j_ʊ_l_ˈeɪ_ʃ_ə_n]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.