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Webster 1913 Edition

Adj.

Capable of being affirmed, asserted, or declared; – followed by of;

as, an attribute

affirmable

of every just man

Adj.

That may be asserted or declared; followed by of; as, an attribute affirmable of every just man.

affirmable ‎(comparative more affirmable, superlative most affirmable)

able to be affirmed