For Kant, not only were there analytic propositions and synthetic propositions, but now Kant proposed a third category of proposition which he designated as “synthetic apriori”. In the sense that they have meaning in the world of experience they are synthetic. In the sense in which they can be known in advance of experience they are apriori.
Kant believed that there is a reality that exists outside the world of all possible experience and he designated this world as “noumenal”, the world of things as they are in themselves. He called the world as it appears to us the world of “phenomena.” When Kant and his followers talked of the world of phenomena they speak of what we think of as the actual world, the world of material objects or the empirical world.
