(1)(英格兰古法)边境领主
居于威尔士或苏格兰与英格兰接壤的边境地区的贵族，他们制定并执行自己的私家法律，俨然是土皇帝，此类统治特权于1535年亨利八世时被废除。又称「lords marchers」。

(2)行军者；行进者；请愿者；游行者

• si ita est
• Si judicas, cognosce.
• silence
• silence of accused
• silence of Congress
• silentiarius
• Silent leges inter arma.
• silent partner
• silent system
• silent witness theory
• silk
• silk gown
• silva caedua
• silver bond
• silver certificates
• silver coinage
• silver platter doctrine
• sim
• Si meliores sunt quos ducit amor, plures sunt corrigit timor.
• similar happenings
• similar sales
• similiter
• similiter dicere
• similitude provisions
• Similitudo legalis est casuum diversorum inter se collatorum similis ratio; quod in uno similium valet, valebit in altero. Dissimilium dissimilis est ratio.