adj. Of a statement or hypothesis that can be proven.
the GNU version of the Collaborative International Dictionary of English
adj. Capable of being proved; demonstrable.
The Century Dictionary and Cyclopedia
Capable of being proved or demonstrated.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. capable of being demonstrated or proved
Word Usage
"(Trust your wife) $1500 per month in provable income will very likely be enough for both of you with a 50% reduction in the amount of required income for her."