Adjective allowable has 3 senses
  1. allowable - deductible according to the tax laws
    Antonym:
    nondeductible (indirect, via deductible)
  2. allowable - deserving to be allowed or considered
    Antonym:
    inadmissible (indirect, via admissible)
  3. allowable, permitted - possible to allow; "a degree of freedom allowable among friends"
    Antonym: impermissible (indirect, via permissible)
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