One who creates or establishes cadences; in heraldry, one who determines cadency (ranking among heirs).
From 'cade' or 'cadence' with the agent suffix '-er,' creating a noun for someone who performs the action of establishing cadence or ranking.
In medieval heraldry, the 'cader' was incredibly important—by deciding which son got which cadency mark on the family coat of arms, they literally determined inheritance hierarchies.
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