A word is used "correctly" when the average hearer will be affected by it in the way intended. This is a psychological, not a literary, definition of "correctness". The literary definition would substitute, for the average hearer, a person of high education living a long time ago; the purpose of this definition is to make it difficult to speak or write correctly.
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About Bertrand Russell
Bertrand Russell was a 19th-century English philosopher and logician. Bertrand Arthur William Russell, 3rd Earl Russell, was an English philosopher, logician, mathematician, and public intellectual. He influenced mathematics, logic, set theory, and various areas of analytic philosophy. Read more on Wikipedia →