Dilemma v. Dilemna

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My family recently became divided over the true spelling of the word, 'dilemma'. While that, of course, is the correct spelling; many relatives were adamant that 'dilemma' should actually read 'dilemna'. Following a basic Google search, I discovered that the division regarding the spelling of dilemma/dilemna was not confined to my family and was borne from a typographical error in an early twentieth century textbook. My question, fellow MyLotters, is this - do you spell it 'dilemma' or 'dilemna'?