transubstantiation n. + Add to list UK //tɹænsəbstˌænʃɪˈeɪʃən// tran·sub·stan·ti·a·tion SynonymsEtymology Synonyms transmutationOriginLA-MEDtrānsubstantiātiō→ENtransubstantiation Borrowed from Medieval Latin trānsubstantiātiō.