A more thorough explanation:

POTENTIA PROPINQUA

Potentia propinqua is a Latin term that means "common possibility."

• It is a potentia propinqua that it will rain tomorrow.
• There is a potentia propinqua that the stock market will go up next week.

These examples illustrate the definition of potentia propinqua by showing that there is a likelihood or possibility of something happening, but it is not certain. It is a common possibility that it will rain tomorrow, but it might not. Similarly, it is a common possibility that the stock market will go up next week, but it could also go down.