Adjective
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convenient for use or disposal
"the house is available after July 1"
"2000 square feet of usable office space"
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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"
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capable of being put to use
"usable byproducts"