a priori

英[.eiprai'ɒ:rai]

由因及果的, 演绎的, 先验的\n[法] 公理的, 自明的

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