This is what I have figured out so far... from reading a dictionary:asaṅkhāta
saṅkhāta = (past participle of saṅkhāyati) agreed on; reckoned -- so-called; named.
saṅkhāyati = 1. to appear. 2. to calculate.
saṅkhāya = having considered, or discriminated.
saṅkhati = = saṅkh + āti, saṅkhāa = enumeration; calculation; a number; definition.
The "a" prefix = "no," "not," or "non."
Nibbāna = asaṅkhāta = not named; not calculated; not defined. Or in other words, it's undefineable. Once someone tries to define it... it stops being nibbāna. It becomes re-ignited once again (a play on the word extinguishment), and then it turns into an endless cycle of saṃsāra for the person trying to figure it out.
Non-duality is a condition, and duality is also a condition. If the person doesn't know any better, the battle in between these two will be never-ending.