seniority systemglossary / SENIORITY SYSTEM seniority system. Employment law. Any arrangement that recognizes length of service in making decisions about job layoffs and promotions or other advancements. 词条贡献者 法律翻译Peter,毕业于一所旨在培养高级翻译专业人才的翻译院校,专注翻译各类与能源与矿业有关的法律文件。