回 (kai)

腕立て伏せ百回。

One hundred push-ups.

上体起こし百回。

One hundred sit-ups.

スクワット百回。

One hundred squats.

一回目は失敗した。

I failed the first time.

この本読むの九回目。

This is my ninth time reading this book.

三回もシャワー浴びたの？

You took three showers?

裸足はだしで歩き回らないこと。

Do not walk around barefoot.

書き直しは一回限りです。

You can rewrite only once. (literally: Rewriting is limited to one time.)

タイに来たのは5回目です。

This is the fifth time I've come to Thailand.

貸し出しは一回三冊限りです。

Check-out is limited to three books at a time.

二、三回も聞けば大体分かる。

Listening two or three times is/will be sufficient for understanding most of it.

子供達はバタバタと走れ回った。

The children ran around with a clattering noise.