For The Love Of God, People ...

It's "millennium."

M-I-L-L-E-N-N-I-U-M.

Two Ls, two Ns. (Two Ms and two Is, for that matter, but not next to each other.)

If I see one more billboard, street sign, or service vehicle with "millennium" misspelled on it, I'm gonna lose it.

Some might argue that I already have.

You don't even have to haul out the dictionary to look it up. Run spell-check. Done.