The Collaborative International Dictionary of English v.0.48:
Incontrovertibility \In*con`tro*ver`ti*bil"i*ty\, n. The state or condition of being incontrovertible. [1913 Webster]WordNet (r) 3.0 (2006):
incontrovertibility n 1: the quality of being undeniable and not worth arguing about [syn: incontrovertibility, incontrovertibleness, positivity, positiveness]