Expressions.
So you literally ignore the fact that the definition includes words, and that your quoted definition of expression also includes "a word"?
If you want to dismiss jargon as slang, go ahead.
It has no bearing on the validity of your claims. They are still pure BS.
FE has jargon, as do many other fields.
As for your second thought... That makes 0 sense. The Earth has an atmosphere. Detailed by science
No it makes perfect sense.
That was not what you were claiming.
You were claiming that the mere lack of existence of a word means it cannot exist; implying that a region of gas above a plane is impossible because there is not a common word for it.
That is pure BS.
The existence of a word has no bearing on if something exists.
You cannot define something into existence.
The science focusing on the atmosphere primarily deals with its composition and how that composition and its properties change. That would work regardless of if it is flat or round.
The science showing it is round is the science showing Earth is round.
If you would like to provide that, do so. But that is an entirely separate argument.
Do you see how silly the whole section in quotes sounds?
Yes. But it is no more silly than the rest of your garbage.
Baselessly asserting that you are right doesn't magically make you correct.
Saying atmodisk isn't a real world so Earth must be round makes no sense.
Fine. Show me undeniable proof.
You were the one claiming you had proof.
I was pointing out that your "proof" amounts to nothing more than bovine excrement.