(1)骑士役土地保有制度
(→tenure)

(2)骑士军事制度
中世纪有其独特的社会、道德及宗教方面行为规范的军事武装人员，从更广义上讲，还包括绅士〔gentlemen〕，并由此产生了骑士役封地和现代的骑士等级制度。

• Public Works Loan Commissioners
• oecumenical
• oeps
• oes
• of
• of age
• of counsel
• of course
• offa execrata
• off-board
• off-broadway booking agreement
• offence
• offender
• Offender Aid and Restoration/O.A.R.
• offense
• offense against the United States
• offense malum in se
• offense malum prohibitum
• offensive
• offensive and defensive league
• offensive business
• offensive language
• offensive weapon
• offer
• offer and acceptance