Absolute can have different meanings. That which is absolute is perfect, free from fault, always the case, without variation, not dependent on opinion, not dependent on circumstances. It can be the ultimate basis of an idea, the underlying unchanging principle of something.
Something that is absolute is that which is perfect in itself, its quality, and nature. It is pure. Absolute truth is that which is true without exception. Something that is absolute is often said to be without dependence on anything else.