I. di-ˈdək-tə-bəl, dē- adjective
Date: 1856
: allowable as a deduction
expenses that are deductible from taxable income
• de·duct·ibil·i·ty -ˌdək-tə-ˈbi-lə-tē noun
II. noun
Date: 1929
: a clause in an insurance policy that relieves the insurer of responsibility for an initial specified loss of the kind insured against ; also : the amount of the loss specified in such a clause