This is the 39th most frequent Japanese word.
回
"回" means "times," "occurrences," or "revolutions."
In this sentence, '回' is used to indicate an occurrence or instance of an event.
今回のイベントはとても楽しかったです。
This event was very enjoyable.
In this usage, '回' is part of the verb '回す', which means to rotate or turn.
ボトルのキャップを回して開けます。
Turn the bottle cap to open it.
Here, '回' is used to denote the number of times an action or event has occurred.