ETYMOLOGICAL PICKS: millenium
This word with obvious Latin origins is properly spelled "millennium," but is often seen with one n missing. The "mill-" prefix obviously refers to one thousand, while the "-ennium" refers to years, deriving from the Latin annum. So the word means, as we all know, one thousand years.
But there is another Latin root that differs only in that it has a single n. That would be anum, or--in the case more familiar to most of us--anus.
And so, "millenium," as distinguished from "millennium," means not one thousand years, but one thousand assholes!