Simple Definition of a priori
: relating to what can be known through an understanding of how certain things work rather than by observation
Full Definition of a priori
Examples of a priori in a sentence
There's no a priori reason to think your expenses will remain the same in a new city.
<an a priori argument for the defendant's innocence>
Origin of a priori
Latin, literally, from the former
First Known Use: 1652
Seen and Heard
What made you want to look up a priori? Please tell us where you read or heard it (including the quote, if possible).