convenient for use or disposal; "the house is available after July 1"; "2000 square feet of usable office space"使用または処分に便利な使用可能
例:2000 square feet of usable office space 2000平方フィートの使用可能な事務所の面積
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"使用またはサービスに適したさま、あるいはそれらの準備ができたさま使用可能