Usage; the way something (an object or a word) is used. Instructions or typical ways of using described in manuals or dictionaries.
薬の用法・用量を守って服用してください。
Please follow the drug's usage and dosage instructions when taking it.
辞書でその単語の用法を確認したほうがいい。
You should check the usage of that word in the dictionary.
この表現は口語と文語で用法が異なる。
This expression has different usages in spoken and written language.