Learner's definition of USAGE
1 [noncount]
a : the act of using something使用；利用 -
Seat belt usage in the state is now mandatory.这个州强制使用安全带。
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Usage [=use] of this exit is prohibited.这个出口禁止使用。
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drug usage among college students大学生当中的吸毒情况
b : the way that something is used用法 c : the amount of something that is used用量 d : how often something is used利用率 2
: the way that words and phrases are used in a language（词语的）用法，说法，惯用法 [noncount]
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This word occurs in casual/common/popular usage.这个词出现在非正式/常用/流行用法中。
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differences between British and American usage英美用法的不同之处
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educated/formal usage正规/正式用法
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modern/current usage现代/流行用法
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a usage manual/guide/dictionary用法手册/指南/词典
[count]