Source : Webster's Revised Unabridged Dictionary (1913)

Operable \Op"er*a*ble\, a.
   Practicable. [Obs.]

Source : WordNet®

operable
     adj 1: capable of being treated by surgical operation; "an operable
            cancer" [ant: {inoperable}]
     2: fit or ready for use or service; "the toaster was still
        functional even after being dropped"; "the lawnmower is a
        bit rusty but still usable"; "an operational aircraft";
        "the dishwasher is now in working order" [syn: {functional},
         {usable}, {useable}, {in working order(p)}, {operational}]
     3: usable for a specific purpose; "an operable plan"; "a
        practicable solution" [syn: {practicable}]