Sublunary is an adjective that means relegated to Earth or mundane.

Our word of the day combines the Latin word luna (LOON uh) with the prefix S-U-B and the suffix A-R-Y. When combined we get a word that means ‘under the moon’ or ‘related to the terrestrial world.’ Used more metaphorically, it means ‘ordinary.’

When I saw that strange orb in the sky, I thought I was witnessing a UFO. But the incident was actually more sublunary. I had simply seen a weather balloon floating by.