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WordNet (r) 3.0 (2006) (WordNet)

usable
adj 1: capable of being put to use; "usable byproducts" [synonym:
{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" [synonym: {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" [synonym:
{available}, {usable}, {useable}]