If people decide that something is allowable, they let it happen without trying to stop it. Capital punishment is allowable only under exceptional circumstances. = permissible
deductible according to the tax laws possible to allow; "a degree of freedom allowable among friends" deserving to be allowed or considered
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