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Apriori Definition from Arts & Humanities Dictionaries & Glossaries
[B:xvii] Kant opposes a priori and empirical knowledge. He distinguishes between pure theoretical reason, pure practical reason, and mathematics, all of which are sources of a priori knowledge, and he also claims that we have a peculiar kind of a priori knowledge of the self. For Kant, a priori knowledge is certain, and the possibility of a priori knowledge about concepts and intuitions is grounded on his so-called "Copernican Revolution", according to which "we suppose that objects must conform to our knowledge"--Kant argues that the "rules" of sensibility and the understanding are "in me prior to being given to me, and therefore as given a priori". It is the possibility of such a priori knowledge, he thinks, that "promises to metaphysics...the secure path of a science". His programme involves (1) "explaining how there can be knowledge a priori" and (2) "furnishing satisfactory proofs of the laws which form the a priori basis of nature" (thereby showing in what sense objects must conform to our knowledge). He insists that a priori speculative (theoretical) knowledge is limited to possible experience (and thus to the realm of appearances, and their construction by the faculties of our minds); however, it is possible through practical a priori knowledge to "pass beyond the limits of all possible experience" [A2/B3] Kant gives the general definition of a priori knowledge as "knowledge absolutely independent of all experience. Opposed to it is empirical knowledge, which is knowledge possible only a posteriori , that is, through experience. A priori modes of knowledge are entitled pure when there is no admixture of anything empirical [but not all a priori propositions are pure, e.g., the causal maxim is a priori but not pure]".
Apriori Definition from Encyclopedia Dictionaries & Glossaries
A priori is Latin for "from the former" or "from before", and may refer to:
- A priori knowledge is justified by arguments of a certain kind
- A priori (languages), a type of constructed language
- Apriori algorithm, a classic algorithm for learning association rules
- A priori estimate of a solutions of a differential equation
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The terms a priori ("from the earlier") and a posteriori ("from the later") are used in philosophy (epistemology) to distinguish two types of knowledge, justifications or arguments. A priori knowledge or justification is independent of experience (for example "All bachelors are unmarried"); a posteriori knowledge or justification is dependent on experience or empirical evidence (for example "Some bachelors are very happy"). A posteriori justification makes reference to experience; but the issue concerns how one knows the proposition or claim in question—what justifies or grounds one's belief in it. Galen Strawson wrote that an a priori argument is one in which "you can see that it is true just lying on your couch. You don't have to get up off your couch and go outside and examine the way things are in the physical world. You don't have to do any science." There are many points of view on these two types of assertions, and their relationship is one of the oldest problems in modern philosophy.
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