Free time; spare time between tasks, classes, or other obligations.
昼休みの空き時間に図書館で勉強した。
I studied in the library during my free time at lunch.
授業と授業の空き時間に友達と話した。
I talked with my friends during the spare time between classes.
週末の空き時間を使って料理教室に通い始めた。
I started attending a cooking class using my free time on weekends.
空き時間が多いので、パートを探している。
Since I have a lot of spare time, I'm looking for a part-time job.