The empirical method of thought, on which all the scientific achievements of the past were founded, is opposed to the most fundamental principles of Ingsoc.
But in matters of vital importance — meaning, in effect, war and police espionage — the empirical approach is still encouraged, or at least tolerated.
This failed to happen, partly because of the impoverishment caused by a long series of wars and revolutions, partly because scientific and technical progress depended on the empirical habit of thought, which could not survive in a strictly regimented society.
There are no more uses of "empirical" in the book.
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Is her theory supported by empirical data?
Empirical studies provide inputs for our formulas, but the formulas themselves are largely based upon intuitive values.