Usage of that
In this sentence, what is the meaning of that?. Is it used instead of because?.

Happiness cannot be defined easily for the simple reason that it is relative.

Thank you

Question

Usage of that
In this sentence, what is the meaning of that?. Is it used instead of because?.

Happiness cannot be defined easily for the simple reason that it is relative.

Thank you

Answer

Here that in my opinion would be the equivalent of which
which is relativity how everything is connected to each other

Answer

“For the reason that” = because.    Grammatically, “that” may be a relative pronoun that introduces the following clause “it is relative.”