The Collaborative International Dictionary
Provably
Provable \Prov"a*ble\, a. [See Prove, and cf. Probable.] Capable of being proved; demonstrable. -- Prov"a*ble*ness, n. -- Prov"a*bly, adv.
Wiktionary
provably
adv. With proof; in a provable manner.
WordNet
provably
adv. in an obvious and provable manner; "his documentary sources are demonstrably wrong" [syn: demonstrably, incontrovertibly]
Usage examples of "provably".
But liberals will never abandon their provably false assertions about Soviet spies.