Correct spelling for the English word "Accrementition" is [ɐkɹˌɪməntˈɪʃən], [ɐkɹˌɪməntˈɪʃən], [ɐ_k_ɹ_ˌɪ_m_ə_n_t_ˈɪ_ʃ_ə_n] (IPA phonetic alphabet).
1. Reproduction by budding of germination. 2. Accretion (1).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.