Usage is the way in which words are actually used in particular contexts, especially with regard to their meanings.
例句
The word 'undertaker' had long been in common usage...undertaker一詞早已廣泛使用。He was a stickler for the correct usage of English.他非常注重英語的正確使用。
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用法；慣用法
A usage is a meaning that a word has or a way in which it can be used.
例句
It's very definitely a usage which has come over to Britain from America.這個用法肯定是由美國傳到英國來的。
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使用；處理；對待
Usage is the degree to which something is used or the way in which it is used.
例句
Parts of the motor wore out because of constant usage...發動機的一些部件因為經常使用而磨損了。If your water usage is very small it may be worthwhile opting for a meter.要是用水量很小，就可以考慮裝一個水表。