– quoting Jed McKenna –

The name of God is Truth. 
– Hindu proverb –

Truth Realization, Consciousness, Awareness, Non-dual abiding, No-self, All that is, God, The One, The Source of all, The One center of all, Truth.

These terms do not capture it, but at least they seem the least misleading terms. No one can tell you what it is. It’s not a thing, it’s not a concept, it’s not a place. Truth realization is that which cannot be simplified further. The term Non-Dual Awareness is an attempt to capture the living reality of otherlessness in words. The best term might be Truth-Realization.

Truth is absolute, there’s nothing more than that, so if someone says enlightenment doesn’t mean truth-realization, then it’s enlightenment they’re diminishing, not truth. There’s nothing more than truth, and anything less than true is false, so to say that enlightenment means something other than truth-realization necessarily means you’re saying it’s within delusion, which doesn’t sound very enlightened.