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1.
Somebody who can't fly.

Not really a derogatory term, but discriptive. Similar to groundhog.
Don't take your cessna below a thousand feet over a city, you don't want to bother the groundlings.
by Athene Airheart March 19, 2005
 
2.
a living being that cannot fly and hence that is confined to the ground. Also called landling.
Human beings are groundlings.
by uttam maharjan October 20, 2010
 
3.
People who are stuck on the ground all the time.

A non-pilot.

Someone who can't fly.

Also, Groundhog.
"Wow, look at all those groundlings! It's too nice a day to be stuck down there!"
by Athene Airheart March 14, 2004