Capable of being devised, invented, planned, or transferred by will; subject to devise.
From devise (Old French 'deviser,' to arrange or invent) plus -able (Latin suffix meaning capable of). Common in property and inheritance law.
The suffix '-able' (from Latin) is remarkably productive in English—'readable,' 'lovable,' 'devisable'—and speakers instinctively understand new -able words even if they've never encountered them before, showing suffix mastery in native competence.
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