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In one usage a term for a function or predicate that takes more than one argument. Sometimes a function or predicate is polyadic if it is a function that can take a varying number of arguments, or a relational predicate that can relate a varying number of things. ‘a, b…n are brothers’ can be true for varying numbers of people; and similarly ‘the eldest of a, b…n’.

Philosophy dictionary. . 2011.

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