directions; rules of use
Example sentences
国文法の現在形はこれからのことを示す用法が多い。
There are many uses of the 'present tense' of Japanese grammar which indicate things yet to happen.
薬を服用するときは、ビンに書いてある用法に注意深く従いなさい。
When taking drugs, follow the directions on the bottle carefully.
不定詞の形容詞的用法には２種類あり、（１）限定用法、（２）叙述用法。（２）はもちろん主格補語です。
There are two ways of using the infinitive as an adjective, 1. attributive, 2. predicative. Naturally 2. is a subject complement.