Self-study; studying by oneself rather than being taught — learning independently outside of formal instruction.
図書館で英語の単語を自習した。
I studied English vocabulary by myself at the library.
授業の後で自習時間が一時間ある。
There is one hour of self-study time after class.
自習で分からないところはノートに書いて先生に聞く。
I write down what I don't understand during self-study and ask the teacher.
Studying individually in class (often at school) when the teacher is absent or the class is unsupervised.
今日は先生が出張で、午前中は自習になった。
The teacher was on a business trip today, so we had self-study in the morning.
自習の時間は、宿題を進める生徒が多い。
During self-study time many students work on their homework.