My brain just broke. Apparently, there are millions of people across the English-speaking world who have been taught by school teachers and text books to spell dilemma with a silent N.
See the comments such as:
I grew up in Los Angeles, started kindergarten in 1962. I, too, was taught to spell it dilemna. My understanding was that the spelling was later changed. It’s hard to believe that we all were merely being taught to spell a word incorrectly. It had to have been in textbooks all over the country.
I know that I learned the MN spelling at some point in school, because I have always used the mnemonic (please don’t tell me I’ve been spelling THAT incorrectly, too) trick of pronouncing it silently as “dil-em-na” whenever I write it, so that I am (was) sure to remember the important silent-N.
And this was before the coming of the amazing misinformation delivery system known as Teh Interwebs.
Googlefight shows there is a small but significant minority who have been taught to insert a silent-N into dilemma: 346,000 hits compared to 32,300,000 hits.