a priori

1. 1.

   involving deductive reasoning from a general principle to a necessary effect; not supported by fact

   “an a priori judgment”

   Antonymsa posteriori
2. 2.

   based on hypothesis or theory rather than experiment

   Similartheoretical

1. 1.

   derived by logic, without observed facts

   Antonymsa posteriori

Questions about a priori

What does a priori mean?

a priori means "involving deductive reasoning from a general principle to a necessary effect; not supported by fact". That is the primary sense; the word has 3 in total, listed in full on this page.

What is the opposite of a priori?

The recorded antonyms are a posteriori, a posteriori.

Is a priori a common word?

a priori is banded "Familiar" — widely understood, used when the subject calls for it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.