Source : Webster's Revised Unabridged Dictionary (1913)

Ponderable \Pon"der*a*ble\, a. [L. ponderabilis: cf. F.
   pond['e]rable.]
   Capable of being weighed; having appreciable weight. --
   {Pon"der*a*ble*ness}, n.

Source : WordNet®

ponderable
     adj 1: capable of being weighed or considered; "something
            ponderable from the outer world--something of which we
            can say that its weight is so and so"- James Jeans
            [ant: {imponderable}]
     2: possible to ponder; "space flight to other galaxies becomes
        more cogitable" [syn: {cogitable}]