ad. In such a manner as to be capable of being demonstrated, shown or proved.
the GNU version of the Collaborative International Dictionary of English
ad. In a demonstrable manner; incontrovertibly; clearly.
The Century Dictionary and Cyclopedia
In a demonstrable manner; so as to demonstrate; beyond the possibility of doubt; manifestly.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in an obvious and provable manner
Word Usage
"Unquestionably and demonstrably from the Latin word _dies_, in which, however, visibly there is not one letter the same as any one of the seven that are in journal."