(1)加入；插入；添加

(2)设置闰日或闰月
即在历法中加入的日子或月份。

• Old Michaelmas Day
• Old Midsummer Day
• Old Natura Brevium/O.N.B.
• old rent
• old school
• old school physician
• old style calendar
• old style/O.S.
• Old Tenures
• oligarchy
• olograph
• olographic will
• om
• ombudsman
• ome bueno
• omissa vel male appretiate
• omissio
• Omissio eorum quae tacite insunt nihil operatur.
• omission
• omissis omnibus aliis negotiis
• omissus
• omits to provide
• omittance
• omitted property
• omme