Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for a priori from the 1913 edition of Webster's Revised Unabridged Dictionary. Define a priori using one of the most comprehensive free online dictionaries on the web.

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a priori
Part of Speech: noun
Results: 2
1. Characterizing that kind of reasoning which deduces consequences from definitions formed, or principles assumed, or which infers effects from causes previously known; deductive or deductively. The reverse of a posteriori.
2. Applied to knowledge and conceptions assumed, or presupposed, as prior to experience, in order to make experience rational or possible.
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