9 letters · 14 points in Scrabble
adjective deductible according to the tax laws
adjective that may be permitted especially as according to rule
adjective deserving to be allowed or considered
originFrom Middle English allowable, alowable, a borrowing from Old French alouable (Modern French allouable), from allouer, equivalent to allow + -able.
Etymology from Wiktionary, CC BY-SA 3.0