(a.) Capable of being proved; demonstrable.

absolute actual admitting no question apodictic attestable authenticatable checkable confirmable demonstrable demonstratable evincible factual historical inappealable incontestable incontrovertible indisputable indubitable irrefragable irrefutable real self-evident substantiatable supportable sustainable testable unanswerable unconfutable undeniable unimpeachable unquestionable unrefutable validatable verifiable