allowable
adjective uk/əˈlaʊ.ə.bəl/ us/əˈlaʊ.ə.bəl/
（法律或规定）允许的，准许的
allowed according to the rules or laws that control a particular area of activity
A certain level of error is allowable (= permitted to happen). 一定程度的错误是容许的。
UK allowable expenses (= expenses on which no taxes are paid) 可免税的消费