margin deficiencyglossary / MARGIN DEFICIENCY margin deficiency. Securities. The extent to which the amount of the required margin exceeds the equity in a margin account. [Cases: Securities Regulation 45.11.] 词条贡献者 法律翻译Terence,毕业于欧洲顶尖的高级翻译学院,专注翻译各类与房地产与土地使用诉讼有关的法律文件。