oaad 全名是oxford advanced american dictionary
对标的是oald。
该词典和oald10一样在OLD官网免费查询，就是oald是全免费的，oaad是部分免费（用得少，没法细说）
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Oxford Advanced American Dictionary 其实不怎么好
以 cubicle 为例：
OAAD 把英式用法与美式用法混在一起了
a small room that is made by separating off part of a larger room
• a shower cubicle
• an office cubicle
看看韦氏高阶词典
1. chiefly US : a work space in a large office with a desk that is usually surrounded by low walls
• an office cubicle
2. British : a small space in a public room (such as a bathroom) that has walls for privacy • a shower/toilet cubicle [=(US) stall]
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所谓的OAAD就是牛津惯用的一鸡多吃，其实就是NOAD的一个删节版，还整过一个“大学版”，“美语”也不是牛津词典的强项，参见#4的回复。
看起来更像是 ODE 的删节版，还以 cubicle 为例：
ODE
A small partitioned-off area of a room, for example one containing a shower or toilet, or a desk in an office
NOAD
A small partitioned-off area of a room, for example one containing a bed in a dwelling (本义) or one containing a desk in an office
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