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On entering the War Master's TARDIS control room, the Eighth Doctor noted that the a prioritron, the randomiser and the safety locks were still operational. (AUDIO: The Castle of Kurnos 5)
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In philosophy, something a priori can be known without sense experience, coming before experience, as contrasted with a posteriori knowledge, which is gained through empirical observation. These terms are central to Immanuel Kant's pursuit of synthetic a priori knowledge, a priori knowledge which is not presupposed in its own formulation.