Definition of a priori
1a
: deductive
b
: relating to or derived by reasoning from self-evident propositions — compare a posteriori
c
: presupposed by experience
2a
: being without examination or analysis : presumptive
b
: formed or conceived beforehand
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share a priori
Time Traveler for a priori
The first known use of a priori was in 1652
See more words from the same year