the GNU version of the Collaborative International Dictionary of English
adj. Capable of being affirmed, asserted, or declared; -- followed by of.
The Century Dictionary and Cyclopedia
Capable of being affirmed, asserted, or declared: followed by of: as, an attribute affirmable of every just man.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. capable of being affirmed or asserted
Word Usage
"Just as the filioque seems to me logically affirmable in addition to, not instead of, the monarchy of the Father, so the doctrine of papal authority defined at Vatican I is logically affirmable in addition to, not instead of, synodality."