acidification acidification /əˌsɪdɪfɪˈkeɪʃən/

noun

1. The process of becoming acid or being converted into an acid  ( acidification )
   the process of becoming acid or being converted into an acid
    Environmentalists are concerned about the acidification of oceans due to increased carbon dioxide levels.
   Environmentalists are concerned about the acidification of oceans due to increased carbon dioxide levels.