Able to be prevented, escaped, or gotten out of; not necessary or inevitable.
From 'avoid' plus the suffix '-able' (capable of being), derived from Old French 'avoider' (to empty or get away from), with roots in Germanic languages.
Courts use 'avoidable' to describe debts in bankruptcy that weren't legally necessary, like frivolous purchases—it's the legal way of saying 'you didn't have to do that.'
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