Even A Genius Will Struggle To Get 100% On This Simple Spelling Test Life Hacks July 16, 2019 Which is the correct spelling? 53% Retry Correct Incorrect Double l’s and n’s for millennium: a thousandth anniversary. Next Prisma Bildagentur/UIG via Getty Images Prisma Bildagentur/UIG via Getty Images Which is the correct spelling? Milennium Millennium 53% Scroll down to continue on! Next