In every language with a finite number of words there must be words that are not definable in terms of simpler words/concepts. Perhaps you’ve stumbled upon such a word with “truth”. I think it is obvious to most people reading what I wrote that what is meant though.

I suspect your parent intended to imply that in practice "truth" is largely socially-generated. So your objective definition would be moot.

Not that I'd necessarily agree, its just an interpretation.

A linguistic extension of godels second incompleteness theorem? Interesting.

The truth is the set of things which are true.