I understand the correct spelling is 'dilemma' but many people I've spoken with, including myself, were convinced the spelling was 'dilemna'.
A quick search on google shows this is not isolated to just America. Many people claim they were taught the incorrect spelling in school. I don't remember where I learned to spell the word but I've always spelled it with 'mn' not 'mm'.
Whats the cause of this? Is there some long forgotten etymology of dilemma that involves an 'n'?