As long as it is legal, it can be defined as a car/truck/bike. Illegal vehicles get more complex, because as you mentioned the frame can be modified.
Such a definition could not theoretically exist
With infinite time, perhaps it could. I’ll give you that one for free, I did exaggerate by saying it was entirely impossible. But for the vast majority of people it is impossible within their lifetime to create such a definition.
Should it really define whether they can or can’t use a word?
Anyone can use any word, just not necessarily correctly. For example, “fish” are not real. There is no defining feature-set for a fish. However, when I say “fish” you think of a little, wet, scaley fella with silly eyes. And that’s fine because communication happens and meaning is understood, but there is no way to define a fish in a way that includes all of the little scaley fellas, jellyfish, sunfish, etc… The same logic is true for the argument about “women”, there is no defining feature-set which includes all AFAB people and zero AMAB people because the lines are too blurry in genetics. An androgen-insensitive XY person with a vagina would still be AFAB, for example.
As long as it is legal, it can be defined as a car/truck/bike. Illegal vehicles get more complex, because as you mentioned the frame can be modified.
With infinite time, perhaps it could. I’ll give you that one for free, I did exaggerate by saying it was entirely impossible. But for the vast majority of people it is impossible within their lifetime to create such a definition.
Anyone can use any word, just not necessarily correctly. For example, “fish” are not real. There is no defining feature-set for a fish. However, when I say “fish” you think of a little, wet, scaley fella with silly eyes. And that’s fine because communication happens and meaning is understood, but there is no way to define a fish in a way that includes all of the little scaley fellas, jellyfish, sunfish, etc… The same logic is true for the argument about “women”, there is no defining feature-set which includes all AFAB people and zero AMAB people because the lines are too blurry in genetics. An androgen-insensitive XY person with a vagina would still be AFAB, for example.
Also out of curiosity, how do you define an El Camino? I’ve always wondered lol car or truck?