1. 可能性；几率；概率
    The probability of something happening is how likely it is to happen, sometimes expressed as a fraction or a percentage.

    e.g. Without a transfusion, the victim's probability of dying was 100%...
           如果不输血，患者必死无疑。
    e.g. The probabilities of crime or victimization are higher with some situations than with others...
           在有些情况下，犯罪或受害的几率要相对更高。

2. 可能性；或然性
    You say that there is a probability that something will happen when it is likely to happen.

probability在线翻译

    e.g. There's an excellent probability that unless action is quickly taken, pipes will freeze...
           除非立即采取行动，否则管道很有可能冻住。
    e.g. If you've owned property for several years, the probability is that values have increased...
           如果一处房产已经拥有多年，有可能它已经增值了。

3. 很可能
    If you say that something will happen in all probability, you mean that you think it is very likely to happen.

    e.g. The Republicans had better get used to the fact that in all probability, they are going to lose...
           共和党人最好习惯他们很有可能失败的事实。
    e.g. In all probability, the final upturn in their fortunes is some months away yet.
           很可能再过数月他们才会转运。