mismerge noun 1verb 1forms 3 noun1 •The act or process of mismerging.Until that identifying segment is corrected or suppressed, or unless the CRA manually edits the file, the mismerge will continue and likely become worse. — 2007 verb1 •To merge incorrectly.This merge criterion guarantees that regions whose properties have been drastically altered by previous merges are not mismerged on the basis of their original properties . — 1994 formsmismerged · mismerging · mismerges