Morphological erosion

/mˌɔːfəlˈɒdʒɪkəl ɪɹˈəʊʒən/

/mˌɔːɹfəlˈɑːdʒɪkəl ɪɹˈoʊʒən/

the process by which the complexity or number of morphological elements in a word or word form is reduced over time