irrefragability

from The Collaborative International Dictionary of English v.0.48

Irrefragability \Ir*ref`ra*ga*bil"i*ty\
   ([i^]r*r[e^]f"r[.a]*g[.a]*b'l), n.
   The quality or state of being irrefragable; incapability of
   being refuted.
   [1913 Webster]