If you say there is a possibility that something is the case or that something will happen, you mean that it might be the case or it might happen.
反义词
certainty , impossibility
双语例句
例： We were not in the least worried about the possibility that sweets could rot the teeth.
我们一点也不担心糖果可能会腐蚀牙齿。
例： Tax on food has become a very real possibility.
极有可能会征收食品税。