[syn: available, usable, useable]
The Collaborative International Dictionary of English v.0.48:
Usable \Us"a*ble\, a.
   Capable of being used.
   [1913 Webster]
WordNet (r) 3.0 (2006):
usable
    adj 1: capable of being put to use; "usable byproducts" [syn:
           useable, usable]
    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, operable, operational]
    3: convenient for use or disposal; "the house is available after
       July 1"; "2000 square feet of usable office space" [syn:
       available, usable, useable]