Definitions for "Acetification"
The act of making acetous or sour; the process of converting, or of becoming converted, into vinegar.
Wine turning to vinegar
(n) a fault in cider caused by the airborne acetobacter bacteria, which generates acetic acid in the cider. This happens when the cider is allowed to be in contact with air, and is the same fault that can occur in wine and beer. The unmistakable taste of vinegar is the result. Your best bet is to use it as cider vinegar in the kitchen