What is the difference between a priori and de facto knowledge?

aa

Explanation:

De facto knowledge:

It is used to describe that is something exist but that is not officially accepted and recognized. It is not the fact, but it is something about the facts. It comes from a Latin phrase that means in reality over as a matter of facts in legal contexts, de facto describes what happens.  

Priori knowledge:

Priori means what is before were used in the philosophy that originally to distinguishes between arguments from the causes and arguments from the effects. Here are arguments of prior said to cause to the effect.

answer; u.s senate;

answer dissenting;