o'clock
01
時, 丁度
put after the numbers one to twelve to show or tell what time it is, only when it is at that exact hour
例
I usually go to bed around 11 o'clock.
私は通常11時頃寝ます。
She finishes her piano practice at 7 o'clock.
彼女は7時にピアノの練習を終えます。
