DEROGATION Meaning of DEROGATION in English n.1 (foll. by of) a lessening or impairment of (a law, authority, position, dignity, etc.). 2 deterioration; debasement. Etymology: ME f. F d{eacute}rogation or L derogatio (as DEROGATE) Oxford English vocab. Оксфордский английский словарь. 2012