A priori and a posteriori

' ("from the earlier") and ' ("from the later") are Latin phrases used in philosophy to see what is different between some types of knowledge, reasoning, or argument by their reliance on evidence or experience based on experience. knowledge is independent from current experience (e.g., as part of a new study). Examples include mathematics, tautologies, and deduction from pure reason. knowledge depends on . Examples include most fields of science and aspects of .
The terms originate from the analytic methods found in "Organon", a collection of works by Aristotle. Prior analytics () is about deductive logic, which comes from definitions and first principles. Posterior analytics () is about inductive logic, which comes from observational evidence.
Both terms appear in Euclid's "Elements" and were popularized by Immanuel Kant's "Critique of Pure Reason", an influential work in the history of philosophy. Both terms are primarily used as to the noun "knowledge" (i.e. " knowledge"). can be used to modify other nouns such as "truth". Philosophers may use "apriority", "apriorist", and "aprioricity" as nouns referring to the quality of being .