extention 与 extension 的区别这两个词有什么区别

只有extension没有extention
英 [ɪk'stenʃ(ə)n; ek-] 美 [ɪk'stɛnʃən]

n. 延长；延期；扩大；伸展；电话分机
外延
主题：IT专业英语词典E_2 ... extensible markup language (XML) 可扩展标识语言extension 引伸；外延；延伸；延续 extension, multiprocessor architecture (MPAX) 多处理器延伸架构 ...
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N-COUNT An extension is a new room or building that is added to an existing building or group of buildings. (已有建筑或建筑群的) 延伸建筑
例：
We are thinking of having an extension built, as we now require an extra bedroom.
我们正在考虑扩建房屋，因为我们现在需要多一间卧室。
An extension is a part connected to a piece of equipment in order to make it reach something further away. (设备的) 延伸部分
例：
...a 30-foot extension cord.
…一条30英尺的延长线。