Crossword Genius

Known to be true in advance of practical testing (1,6)

Ross

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7

1,6

a priori

(Other definitions for a priori that I've seen before include "it may be deduced" , "Sort of reasoning" , "reasoned logically" , "Deductive (reasoning)" , "Presupposed through reasoning" .)

I've seen this clue in The Times.
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