Full Idea
Kant distinguished between the 'transcendent', which is wholly beyond experience, and the 'transcendental', which, although not strictly part of experience, is a structural feature imminent in it.
Gist of Idea
'Transcendent' is beyond experience, and 'transcendental' is concealed within experience
Source
report of Immanuel Kant (Critique of Pure Reason [1781], B353/A296) by Michael Potter - The Rise of Analytic Philosophy 1879-1930 02 'Trans'
Book Reference
Potter,Michael: 'The Rise of Anaytic Philosophy 1879-1930' [Routledge 2020], p.16
A Reaction
This may be the most disastrous idea in western philosophy since Plato's theory of Forms. How can he claim special insight into the imminent structural features of his own experience, while admitting that he has no experience of these features?