[1] : The Collaborative International Dictionary of English v.0.48

operable \op"erable\, a.
   practicable. obs.
   1913 webster

[2] : WordNet (r) 2.0

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 orderp, operational
     3: usable for a specific purpose; "an operable plan"; "a
        practicable solution" syn: practicable
see also:
inoperable functional usable useable in working orderp operational 
practicable 

[3] : Moby Thesaurus II by Grady Ward, 1.0

39 moby thesaurus words for "operable":
   achievable, actable, appliable, applicable, attainable, banausic,
   compassable, compliant, doable, effective, effectual, efficient,
   exploitable, feasible, fit, functional, in working order,
   manageable, maneuverable, manipulable, manipulatable, negotiable,
   operatable, operational, overcomable, performable, pliable,
   practicable, practical, pragmatic, realizable, reusable,
   serviceable, superable, surmountable, usable, utilizable, viable,
   workable

Operable >> O Words
Operable, definition of term: Operable
operable_pag1.html