Definify.com

Webster 1913 Edition

adv.

In a demonstrable manner; incontrovertibly; clearly.

Cases that

demonstrably

concerned the public cause.

Clarendon.

adv.

In a manner to preclude doubt; beyond the possibility of contradiction.

demonstrably ‎(comparative more demonstrably, superlative most demonstrably)

in such a manner as to be capable of being demonstrated