WordReference Random House Learner's Dictionary of American English © 2014
al•low•a•ble /əˈlaʊəbəl/USA pronunciation adj. 

    that may be permitted:allowable tax deductions.

Collins Concise English Dictionary © HarperCollins Publishers::

allowable /əˈlaʊəbəl/ adj
  1. permissible; admissible

alˈlowably adv

'allowable' also found in these entries:
In the English description:

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