Correct spelling for the English word "Tablement" is [tˈe͡ɪbə͡lmənt], [tˈeɪbəlmənt], [t_ˈeɪ_b_əl_m_ə_n_t] (IPA phonetic alphabet).
There is no etymology available for the word "Tablement". It seems to be a relatively uncommon or possibly non-existent word.