No. We have to see the meaning before we can make a definition. A definition is only a description of a meaning.
Because we were mistaken about the meaning. We used to think it was the gods throwing thunderbolts around but now that we have evidence of how it works, we have a better "meaning".
Where is the “evidence” of this? thunder (v.) 13c., from Old English þunrian, from the source of thunder (n.). Figurative sense of "to speak loudly, threateningly, or bombastically" is recorded from mid-14c.
Because Truth can be defined, and we can use reason to comprehend what is meant by the definition. Also, if events occur, there has to be the truth of how these events occurred.
I'm not making any claim. I'm saying we know now how thunder works - all of the evidence we have about static electricity, sound propagation, etc. supports that knowledge.
As I have said, there's no such thing as "the truth". If you can keep up with the discussion, I'm saying that our "meaning" of thunder has changed. Meaning is not absolute.
Actually you haven’t said that before now, but I figured it out for myself. If I had to keep up with you, I’d have to stop, turn around, and walk miles. Then I’d have to pull you out of the bs you got yourself stuck in. For starters. Can you show that our meaning of thunder has changed?
It's a fact, supported by evidence - i.e. we can make artificial lightning and thunder. Do you have anything to contribute besides questioning the obvious?