I think absolute truth is something that stands on its own, not defined using another.
White would be absolute even though there is black its opposite because we can define white without using black. Let's say black is not there, can we not define white? We can, so white is absolute. Dark would also be absolute even though there is day, dawn, light and so on. We can say dark is black, scary, cannot see in the dark etc. Now, I used black, scary and no visibility to define dark. On that basis dark is not absolute. White consequently is also not absolute. Nothing is absolute. Why? Because what would it mean? How do you say that? And if you can, by using a word or two, then it is not absolute. It is said, "Word is God," but word is explained using meaning, so word also cannot be absolute, it could be God for whatever reason 'cause scripture says so, but then God is not absolute. The letters a, b, c, d etc., they cannot be defined unless by using them, so these kinds of letters would be God considering letters are the shortest words. Maybe that is why "God is a word." "In the beginning was the word and the word was with God, and the word was God." "Sealed unto redemption with the holy spirit(Higher Consciousness - inner guidance) of God." So then word is absolute, God is absolute.