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Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a concept-dependent and activity-dependent real historical construct.

The Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the order underlying any given culture at any given period of history.

The Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the dated, local ground on which ideas could appear and sciences be founded — only, perhaps, to dissolve soon afterwards.

The Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a condition not of validity for judgements but of reality for statements — the a priori of a history actually given, since it is that of things actually said.

The Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not a great, unmoving, empty figure that irrupted one day, tyrannized men's thought, and vanished in an unprecedented eclipse — a transcendental syncopation.

The Historical a priori (n.) rather ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠than heredity, tradition or 'original contributions' explains the history of knowledge, which can be written only from what was contemporaneous with it — conditions and a prioris, not influences.

The Historical a priori (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not a set of eternal problems, nor accumulated knowledge, nor a period's mentality: it is what delimits a field of knowledge, defines the being of its objects, and sets the conditions for speaking truly about things.