What does allowable mean?
The definition of allowable
Al*low”a*ble, a.
Etym: [F. allouable.]

1 Praiseworthy; laudable. [Obs.] Hacket.
2 Proper to be, or capable of being, allowed; permissible; admissible; not forbidden; not unlawful or improper; as, a certain degree of freedom is allowable among friends.