"useable" in the adjective sense
1. functional, usable, useable, operable, operational
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"
2. useable, usable
capable of being put to use
"usable byproducts"
3. available, usable, useable
convenient for use or disposal
"the house is available after July 1"
"2000 square feet of usable office space"
Source: WordNet® (An amazing lexical database of English)
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