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The smartest man in the world answered this question for me 40 years ago but I would think longer words have been introduced since then.The word is "antidisestablishmentarianism".
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I'm moving this to the Puzzles Etc Forum, where I think you will find another thread on this topic.
Comments  
you know what is the longest word in English?
No!?
That´s a piece of cake.
it´s "SMILES".
you know why?
Because between the two "S´s" there is "ONE MILE".
Good isn´t it?