The likelihood or chance that an event will occur; probability, often expressed as a percentage or ratio.
明日雨が降る確率は70%です。
The probability of rain tomorrow is 70%.
宝くじに当たる確率は非常に低い。
The chances of winning the lottery are extremely low.
手順を改善すれば成功の確率が上がる。
If you improve the procedure, the probability of success increases.