Plural of deductible: amounts of money that you must pay yourself before insurance or taxes apply, or things that can be logically deduced.
Plural form of 'deductible,' from Latin 'deducere.' The insurance meaning became standard in the 20th century as health and auto insurance systems developed in America.
Your car insurance deductible is literally the amount you 'deduce' (subtract) from the claim yourself before the insurance company pays—the same Latin root describes both the financial subtraction and logical reasoning.
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